What effect do valence electrons have on the reactivity of elements?
Two elements can react with each other when the electrons in their outermost shells have become positively
Elements become able to react with other elements when their innermost shell has acquired two electrons.
The way elements react with each other is determined by the number of electrons in their outermost shells.
Any element can react with other elements if it has a complete set of electrons in its outermost shell.
Answer:
More Valence electrons add mass to the atom, making it less reactive
1. Simple columnar and pseudostratified columnar epithelium both are considered simple epithelium that consist of column-shaped cells.
A. True
B. False
B. Simple columnar cells line up next to each other whereas there is an irregular arrangement with cells varying in height and shape in pseudostratified columnar epithelium, giving the impression of stratification.
A. True
B. False
Answer:
Both options are true.
Explanation:
The cylindrical epithelium is a simple epithelium, which is characterized by having a cell layer, where all the cells are supported on the basement membrane, and its nucleus has reverse polarization in relation to the rest of the cells of our body, that is, they are found in a not very common position.
Simple cylindrical epithelia are found in areas of absorption or assimilation and exchange of gases or nutrients, since this shape is what allows them optimal diffusion through the epithelium, an example of the tissues in which this cellular architecture is found. They are the intestinal tract and the respiratory tract.
In the case of pseudostratified epithelium, it is very similar in function to the cylindrical one, with the difference that it gives a multilayered appearance, that is, its cells are stacked one from the other, giving the appearance of more than one epithelial layer as the stratified epithelium of our epithelial organ, but nevertheless it is not like that, there are many cells of irregular shape with a support in the basal one, that is why it is a single layer.
This last epithelium is also found in the airways in large numbers.
School is a symbol of social organization.
Explain
Answer:
At School, you communicate and work with your peers to get projects and assignments completed. It involves a lot of communication and social interaction.
Explanation:
What is evolution? Evolution explains how life on Earth diversified. Evolution explains why Earth can support life. Evolution explains how life on Earth began. Evolution explains how fossils form.
Answer:
S.A for Edmentum and Plato
Like and Rate!!!
Explanation:
The interactions and long-term effects of these interactions between organisms and their environments are what lead to evolution and variety. The variety of settings that exist encourages a diversity of creatures that are adapted to them.
What Evolution explains why Earth can support life?The term "evolution" describes the gradual emergence of new traits within a population. This contributes to the explanation of diversity since novel traits might result in the emergence of totally new species and populations.
Darwin argued that species can evolve through time, that new species develop from older ones, and that all species descended from a single progenitor. Organisms are constantly adapting to their environments.
Therefore, In this theory, each species has its own distinct set of heritable (genetic) differences from the common ancestor, which have been slowly building up over very long periods of time.
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In the carbon cycle, decomposition by bacteria causes the:
A. absorption of reactants for photosynthesis.
B. conversion of inorganic carbon into organic matter.
C. release of carbon dioxide from organic matter.
D. breakdown of fossil fuels into usable energy.
SUBMIT
Answer:
C. Release of carbon dioxide from organic matter.
Explanation:
EASY QUESTION. WILL MARK BRAINIEST
What is the relationship between biotechnology, sharkskin, and disease resistance?
a. Bioengineers have developed an artificial sharkskin that does not allow resistant bacteria to grow on it.
b. Disease-causing microbes have been genetically modified to keep them from infecting the skins of sharks.
c. Scientists have created a device that can be attached to the skins of sharks that dramatically increases their abilities to resist disease.
d. Sharkskin produces many chemicals that can be collected and used to create antibiotics.
Answer:
A
Explanation:
a. Bioengineers have developed an artificial sharkskin that does not allow resistant bacteria to grow on it.
What term is used to describe 100’s or 1000’s of amino acids chemically combined?
Answer:
Polypeptide
Explanation:
Amino acids are the building block and simplest unit of protein molecules. The structural composition of each amino acids is made up of an amine group (-NH2), a carboxylic acid group (-COOH), a hydrogen atom (H) and a R side chain that differentiates every amino acid from one another.
In a reaction process called condensation, amino acids are chemically joined together via the amine group of one and the carboxylic group of another. This process releases water molecule (H20) to form a bond called PEPTIDE bond between the amino acids. Several amino acids in their 100’s or 1000’s that are chemically joined this way forms a POLYPEPTIDE chain, which in turn forms the protein molecule.
Rank each of the following uterine changes associated with the menstrual cycle in chronological order using #1 to identify the earliest event.
A. The endometrium thickens due to secretion and fluid accumulation.
B. Menstrual fluid in the uterus accumulates and is discharged.
C. Due to a degeneration of the corpus luteum, the lack of progesterone causes the endometrium to begin to degenerate.
D. The endometrium begins to thicken due to rapid cell division.
Answer:
#1 The endometrium begins to thicken due to rapid cell division.
#2 The endometrium thickens due to secretion and fluid accumulation.
#3 Due to a degeneration of the corpus luteum, the lack of progesterone causes
#4 Menstrual fluid in the uterus accumulates and is discharged.
Explanation:
menstrual cycles is divided into two phases the follicular and luteal phases, each phase takes about 14 days to complete its cycle. At the follicular phase, the lining of the uterus
called the endometrium breaks down and shed as menstrual bleeding. After the follicular phase there is an increase in hormonal level of follicle stimulating hormone and Lutenizing hormone this leads to ovulation and the rupture and release of the egg follicle in the ovary.
luteal phase involves the formation of corpus luteum where the egg ruptures for a new cycle to start.
Which quantity may be calculated directly using Newton’s second law of motion? weight velocity position direction
Answer: Newton's second law of motion can be used to calculate weight.
Answer:
Weight
Explanation:
What are the sources of energy for the providers of Chemical compound
Answer:
Experience gained from over 20,000,000 operating hours. Clean energy production with biomass gasification. wood gasifier. Combined heat and power. Biomass CHP. biomass gasification.
Answer:
1. Natural Gas
2. Natural Gas Liquids
3. Heavy Liquids
4. Electricity
5. Coal
6. Liquefied Petroleum Gas
e.t.c
The periodic table _____.
Answer:
The periodic table _____.
1. is arranged by atomic mass
2. is arranged by number of protons
3. was developed by early alchemists
4. is divided into vertical periods and horizontal groups
Explanation:
Answer:
of elements
Explanation:
Only thing that makes sense, because that's the complete name
please help marking as brainliest image is shown down below with questions. Answer is only needed without explaination.......
Answer:
BrainlySakeen have already wrote it.Which of the following is a hypothesis that could be tested in a High School Biology classroom?
Answer:
Discover the volume of a balloon.
Explanation:
Get a balloon and a piece of paper. Cut the paper to make a line, and make sure it is 100 cm x 2 cm Take on of the balloons and inflate it several times so you are sure you can inflate the balloon with only one breath. Take a deep breath and inflate the balloon. Use a binder clip to hold the neck so no air escapes. Make a measurement of the circumference of the balloon using v = c3/6(pie)2 - the formula is c cubed divided by 6 times pie squared equals volume. Create a graph for them to answer, and then give questions for them to turn in.
1
f(x) =
and g(x) = x - 2
x+5
What are the restrictions of the domain of f(g(x)) ?
Answer: x ≠ -3
Explanation:
the right answer that showed up.
Answer:
its 6
Explanation:
What are the restrictions on the domain of g ∘ f? x ≥ ?<<<<<< that was the question if anyone was confused.
A trait that is adaptive spreads faster through sexually reproducing organisms.
a) true
b) false
Answer:
true
Explanation:
Because it adapts to the repoducting organism
Part 1: Read each question carefully and choose the correct answer.
1. Which statement regarding the peer review process is not correct?
The system of peer review is used to _____.
a. select the research deemed worthy of consideration by others in the field
b. give the authors feedback on the validity of methodologies and reasonableness of conclusions
c. improve the quality of the paper before it is published
d. determine conclusively the conclusions of the paper
2. Compare and contrast the three basic types of experiments. Provide an example of each one to support your statements.
Part 2: Read the passage carefully and then answer the following question.
Researchers at a major university are testing a new drug to lower cholesterol, called Choless. They started the study by testing mice. Once they received the proper FDA clearances, they began trials on humans. They began testing on males, whose ages ranged between 30 and 60 years old. The researchers split the participants into two groups. Group A was given Choless, while Group B was given placebos. A placebo is completely harmless and looks exactly like Choless, but it contains no active medicine. None of the participants knew whether they were taking Choless or the placebo. The participants were to eat a diet low in saturated fats, and high in protein and fiber. Each participant's cholesterol levels were tested and recorded every week.
Based on the passage above, determine each part of the experiment:
subject:
control:
constant:
independent variable:
dependent variable:
Part 3: Identify the independent, dependent, and constant variables for different experiments.
Note: You may have identified constant variables not mentioned in the experiment scenario. So long as these variables are reasonable (such as same weather conditions, same ambient temperature, etc.), they should be accepted as correct.
Experiment 1: A soap manufacturer runs an experiment to compare the foaming action of different dish detergents. Equal amounts of each brand of detergent are placed in identical containers half-filled with water. The water and dish detergent are at a temperature of 20°Celsius. Each container is agitated for 30 seconds, and then the height of the foam is measured.
a. independent variable:
b. dependent variable:
c. constant variable(s):
Experiment 2: A car manufacturer wants to determine the effect of weight on gas mileage for a particular model of car. The gas tanks of ten identical cars are filled with the same type of gas. Each car has a different amount of weight in its trunk. Each car is driven at the same pace around a level track for 200 miles. The amount of gasoline left in each tank is measured.
a. independent variable:
b. dependent variable:
c. constant variable(s):
Experiment 3: A biologist tests different lighting conditions for bacteria. She uses the same number of the same strain of bacteria on each petri dish, with the same type and amount of growing medium on each. Each petri dish is subjected to a different amount of light for a 24-hour period. After this time, the biologist counts the number of bacteria on each petri dish.
a. independent variable:
b. dependent variable:
c. constant variable(s):
Experiment 4: An oceanographer wishes to study the effect of salinity on the growth of a certain type of aquatic plant. Imagine an experiment the oceanographer can conduct and identify the possible variables.
a. independent variable:
b. dependent variable:
c. constant variable(s):
Answer:
1. d
Explanation:
The correct answer would be that the system of peer review is used to determine conclusively the conclusions of the paper.
The system of peer review refers to the process of evaluating a scientific report or paper by one or more independent scientists who have a similar background as the producer of the report or paper.
The reviewers evaluate the methodologies and various claims made by the original researcher and give feedback on their validity as well as make criticism of the paper in order to improve its quality before final publication. However, reviewers do not alter the claims or conclusions of papers, they can only query them.
Hence, options a, b, and c are correct as far as the peer review system is concerned.
The only incorrect option here is d.
2. There are 3 types of experiments, namely:
controlled experimentfield experimentnatural experimentThe controlled experiment involves the comparison of experimental group with control group. The two groups are subjected to the same conditions except for the variable whose effects are being researched.
The field experiment takes place outside the laboratory settings as opposed to other types of experiments. The subjects of the field experiment are studied in their natural environment outside the lab.
The natural experiment involves studying a phenomenon naturally without having control, unlike the controlled experiment. Observations are just recorded and are used to arrive at predictions or hypotheses.
Part 2:
Subject: 30 - 60 years old males
Control: Group B, the placebo group
Constant: Diet.
Independent variable: Administered drugs (choless and placebo)
Dependent variable: cholesterol level.
Part 3
Experiment 1:
a. Independent variable: types of detergent
b. dependent variable: height of foam
c. constant variables: amount of water, container type, temperature, period of agitation.
Experiment 2:
a. independent variable: amount of weight in each car
b. dependent variable: amount of gasoline left in each car
c. constant variable: car, type of gas, speed of car, distance covered by car.
Experiment 3
a. independent variable: amount of light
b. dependent variable: number of remnant bacterial cells after exposure to light
c. constant variable: initial number of bacteria, petri dish, type/amount of growth medium.
Experiment 4
a. independent variable: level of salinity
b. dependent variable: biomass of plant
c. constant variable: type of plant, period of growth, growth conditions.
you and two friends enter a contest to count the number of jelly beans in a jar. your guess are 371, 271, and 500. the actual number is 700. based on this information, which of the following statements is true
Answer:
Neither precise nor accurate.
The values are not close to 700 (not accurate) nor are they close to each other ( not precise)
A study where you try to observe subjects in a natural environment is a(n):
A. hypothetical study.
B. performance study.
C. observational study.
D. experiment.
Consider these sentences. Scenario A: Carmen reads an article in Tasty Food magazine stating that eating an apple can help you feel awake and alert. Scenario B: Yuki reads an article in the Professional Journal of Medicine stating that ginger root can help prevent some types of cancer. Which article is more likely to have been peer reviewed? How do you know?
Answer:
Scenario B is more likely to have been peer-reviewed because it was published in a scholarly journal (Professional Journal of Medicine).
Explanation:
A peer-reviewed article is an article that has undergone review by experts in the same field as the author in order to ascertain how original and quality-oriented the article is before publication in a journal. The experts from the same research field as an author are the "PEERS". A successful peer-reviewed article is deemed to be of high quality.
Although there are many features an article must possess in order to know it has been peer-reviewed but one of the most important features is that the article will be published in a REPUTABLE SCHOLARLY JOURNAL. This is the case of the article in scenario B, which was published in the Professional Journal of Medicine not just any non-academic random magazine as in scenario A.
Answer: The article that Cicely read (Scenario B) has been peer reviewed. This article is published in a scientific journal and has been judged for quality by other professionals in the field.
Explanation: I just took the quiz on Edge, I hope this helps!
Worldwide health issues are complex real-world problems. So why is there often not a single solution to these problems?
Answer:
Worldwide health issues are complex real-world problems because this problems are usually caused by diseases, pests, vectors and poor hygiene. All the factors listed vary according to geographical and economic conditions. Hygiene is good and better in first world countries such as USA and very poor in Third World countries.
Pests and diseases are also sometimes peculiar to a certain area which makes the issue of solving world health issues a very complex one as a result of it not being universal most of the time.
What is a contributor of global warming? A. aerosol sprays B. carbon dioxide C. acid rain D. garbage
If a purebred white horse C^w and purebred black horse C^B are bred together, what is the likehood that their offspring will roam with both colors represented?
O 0%
O 25%
O 50%
0 100%
Answer:
The likelihood that their offspring will roam with both colors represented is of 100%.
Explanation:
The exposed example brings up the case of a codominance example. When the hair color of horses is codominant, roan coats occur. Roan horses express both the colored and the whited hairs, with some of the animal´s parts expressing mostly the colored hairs, such as head, tail, and legs. These animals have white hair and another solid color (such as black). When two purebred animals with different genotypes and phenotypes are crossed, the whole offspring will be heterozygous. In this case, a purebred white horse C^w and purebred black horse C^B are bred together. The offspring will carry the heterozygous genotype C^wC^B. The offspring will have both red and white hairs.
In codominance, both alleles can be expressed. In these cases, heterozygote individuals instead of showing an intermediate phenotype, express both of the alleles (red and white hair). Their phenotype is an additive expression of their parents' genes.
Cross) purebred white horse C^w and purebred black horse C^B
Parental) C^w C^w x C^BC^B
Gametes)C^w C^w C^B C^B
F1) 100% roan animals, black and white.
100% Heterozygous C^wC^B
In sheep, white is due to a dominant gene (W), black to its recessive allele (w). A white ewe mated to a white ram produces a black lamb. If they produce another offspring, could it be white? If so, what are the chances of it being white? List the genotypes of all animals mentioned in this problem.
Answer:
Yes, 75%
Explanation:
Since the first offspring produced between the ram and the ewe was black you can determine that both sheep have a recessive and dominant allele. Both of the parent's genotypes would be Ww, this is because they both have the white phenotype and they were able to produce a black offspring. Since both parents have a genotype of Ww the probability of a black offspring being produced is 25% and 75% for a white lamb.
Which of the following is an example of pseudoscience? A. Horoscopes B. Radiometric dating C. Electromagnetism D. Biology
Answer:
Horoscopes
Explanation:
pseudo means not genuine and the others have science backing them
You water three sunflower plant with salt water. Each plant receives a different concentration of salt solutions . A fourth receives pure water. After a two -week period, the height is measured . What is the independent, dependent and controlled variable.
Answer:
Independent - Water/Type of water (salt and pure)
Dependent - Height of plant
Controlled - Amount of water
Explanation:
Independent is what the experimenter manipulates (in this case being the type of water.)
Dependent is what the experimenter measures and is a result of the independent (in this case being the height of plant)
Controlled is what you are trying to keep the same (in this case the amount of water you give each plant.)
In the experiment given, the independent variable is the salt water, the dependent variable is the height of each plant, and the sunflowers are the control variable.
Variables in an experiment can be one of three kinds:
Control Dependent IndependentThe dependent variable is the variable that will change based on the other variables, this is often what the experiment seeks to measure. In the case given, the variable that will be measured is the height of the plants, therefore this is the dependent variable.
The independent variable is one that will not depend on the other variables in the experiment. Since the salt water used for each plant does not depend on the kind of plant or on its height, we can infer that the salt water is the independent variable of this experiment.
The control variable is the variable that remains constant in an experiment in order to not affect the outcome. Since for each case in this experiment there is no difference in the kind of plant that is used, we can say that the sunflower plant is the control variable.
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What accounts for the difference in the functions and properties of molecules like starches, glycogen, cellulose, and chitin?
Answer:
The difference in function and properties of polysaccharides such as starch, glycogen, celluose and chitin is due to the differences in their recurring monosaccharide units, the types of bonds linking these units and the degree of branching in the molecules.
Explanation:
Polysaccharides are large molecules of carbohydrates which are made up of recurring monosaccharide units. Examples of polysaccharides are starch, cellulose, glycogen and chitin. Each of these polysacccharides show differences in structure, properties and function. The difference in function and properties of polysaccharides such as starch, glycogen, celluose and chitin is due to the differences in their recurring monosaccharide units, the types of bonds linking these units and the degree of branching in the molecules.
Starch is the storage carbohydrate in plants and is composed of two types of glucose polymers, amylose and amylopectin. Amylose is composed of unbranched chains of D-glucose units linked to each other by (α1→4) glycosidic bonds. Amylopectin is a branched glucose polymer linked to each other by (α1→4) glycosidic bonds and (α1→6) at the branching points.
Glycogen is the storage polysaccharide in animals which is highly branched and compact. It is composed of (α1→4) linked glucose subunits with (α1→6) at the branching points.
Cellulose is a fibrous, tough and water-insoluble substance found in plant cellwalls. It is is a linear unbranched polysaccharide made up of D-glucose units linked together by (β1→4) glycosidic bonds.
Chitin is is the main component of the exoskeletons of athropods. It is a linear molecule composed of N-acetylglucosamine units linked together by (β1→4) glycosidic bonds.
In biology, interacting populations in a particular area are called an
A student designed an experiment to test
the effects of light and water on plant growth
How could this experiment be improved?
A. Add temperature as a variable
B. Add pH (acidity level) as a variable
C. Remove water or light as a variable,
so only one variable is tested at a time
D. All of the above
Answer:
D. All of above
Explanation:
This is because we can add temperature as a variable to improve the light, pH as a variable to improve the water, and remove water or light as a variable to make the experiment on light or water even obvious.
Several classes of students wanted to know if the temperature of the soil changed with the temperature of the air. They
recorded the temperature of the soil and the air in the same place, three times a day, for three days. Each class made a chart.
At the end, two classes compared charts. Their results were different.
What could the students in the two classes do to figure out why their results were different?
A)
They could see which chart looks the best.
B)
They could go to a third class and copy their results.
They could check each others' work and look for mistakes.
D)
They could let the teacher tell them whose numbers are correct.
10. Read the following hypothesis: Plants that receive too much water will not grow well because their roots
begin to rot. Suppose an investigation is planned to explore the hypothesis. What is the independent
variable of the investigation?
the amount of water given to the plants
the type of plant that is used in the experiment
the height of the plants at the end of the experiment
the mass of the plants at the end of the experiment
Answer:
the amount of water given to the plants
Explanation:
the independent variable is the variable that the researcher controls. if you want to see how the amount of water affects roots, you would add less or more water, which is the variable that is being controlled by the researcher!
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