Answer: Antibody tests are not useful because in endemic areas over 95% of the population has been infected without contracting the disease.
(if this is the right answer mark brainliest)
Which substance is not excreted by the body
Answer:
Saliva
Explanation:
The cells in this part of a plant form long, vertical tubes. What is the most
likely relationship between the structure and function of these specialized
cells?
O A. The tubes allow water and nutrients to be transported throughout
the plant.
O B. The tubes prevent potential damage to the leaves caused
used by
strong winds.
C. The tubes allow the plant to absorb sunlight for photosynthesis.
O D. The tubes prevent water loss from the leaves.
Answer:
A. The tubes allow water and nutrients to be transported throughout
the plant.
think about what you know about plant roots. how do plants absorb mineral salt from the soil?
Answer:
Plants absorb water from the soil by osmosis and they absorb mineral ions from the soil by active transport, against the concentration gradient.
What was Anton van Leeuwenhoek contribution in the development of cell theory
Answer:
animalcules
Explanation:
that is it i think
Which chloroplast structure increases the amount of surface area that is available for photosynthesis
Answer:
Thylakoid
Explanation:
A thylakoid is a sheet-like membrane-bound structure that is the site of the light-dependent photosynthesis
Which of these choices is the original source of energy that humans receive from consuming
an herbivore such as a cow?
Answer:
the glucose we make from eating the cow
label the eye, thank you
Answer:
L = lens
M = Retina
Explanation:
Hope it is helpful....
A founding population usually has lower genetic diversity than the original population it came from. For those alleles that are shared by the two populations, how are allele frequencies different (or similar)
Answer:
In the founding population, the allele frequency is different from the original bigger-sized population. The size of the new population affects this difference even more. Some of the alleles will tend to increase, while some others will tend to decrease in frequency.
Explanation:
Genetic drift is an evolutive force. It is the random change that occurs in the allelic frequency of a population through generations. Its effects are harder in a small-sized population, meaning that the magnitude of this change is inversely related to the size of the original population.
Genetic drift results in some alleles loss -including the beneficial ones-, while some other alleles get fixated. Low-frequency alleles are the most likely to be lost. The changes produced by genetic drift accumulate in time and results in a loss of genetic variability within a population.
Genetic drift affects a population and reduces its size dramatically due to a disaster or pressure -bottleneck effect- or because of a population split -founder effect-. The bottleneck effect most likely affects smaller populations.
Founder effect refers to the origin of a new population from only a few individuals that are coming from a bigger-sized population. These founder individuals, which are carrying some of the genes of the original population, settle down in a new area and reproduce. The new and small population might or might not be genetically representative of the original one. Some rare alleles might be exceeded or might be lost by complete. Consequently, when the small population increases in size, it will have a genetically different composition from the original one. In these situations, genetic variability is reduced, and there exists the possibility of developing a peculiar allelic composition. When the number of individuals that originated the new population is low, the founder effect will be very extreme because the genetic drift effects are inversely proportional to the original number of individuals.
A state in which an object is in motion. OA. static B. dynamic OC. vector OD.scalar
Answer:
the answer is gonna be c
Explanation:
that is all
What causes global circulation?
1. the Earth's core cools down some areas more than others
2. parts of the world heat up differently
3. the water in the oceans acts as an insulator
4. the sun stops emitting radiation at night
Answer:
parts of the world heat up differently
Explanation:
Please Mark me brainliest
Please help
Please answer correctly
Answer:
1 a
2 b
3 c
Explanation:
ILL GIVE BRAINLIST PLS HELP
Answer:
1.In biology, evolution is the change in the characteristics of a species over several generations and relies on the process of natural selection. The theory of evolution is based on the idea that all species? are related and gradually change over time.
2.Survival of the fittest is a simple way of describing how evolution (the process by which gradual genetic change occurs over time to a group of living things) works. It describes the mechanism of natural selection by explaining how the best-adapted individuals are better suited to their environment.
During pulmonary ventilation, relaxation of the diaphragm and external intercostals ________ and air flows out of the lungs. increases the pressure in the thoracic cavity flattens the floor of the thoracic cavity increases the volume of the thoracic cavity expands the rib cage stimulates the phrenic nerve
Answer:
Increases the pressure in the thoracic cavity
Explanation:
During pulmonary ventilation, relaxation of the diaphragm and external intercostals increases the pressure in the thoracic cavity and air flows out of the lungs.
Pulmonary ventilation involves the exchange of air in the body. The exchange mainly takes place between the lungs and the the blood. When the lungs take in oxygen it distributes it to other parts of the body after which the byproduct is expelled in the form of Carbon dioxide.
The diaphragm and intercostal muscles are found close to the chest(thoracic) region such that when air is expelled it produces a similar effect such as relaxation of the diaphragm which also makes the chest muscles go down and exert pressure. This mechanism aids the expulsion of Carbon dioxide from the lungs.
Cigarette smoke contains carbon monoxide. Explain how this
would affect the normal functioning of red blood cells in a person who
smokes cigarettes.
Answer: Carbon Monoxide is a very harmful and toxic gas which is formed from incomplete combustion of carbon.
Explanation: red blood cells contain haemoglobin ,which are responsible for carrying oxygen into our body system. So oxygen combines with haemagoblin to form oxyhaemogoblin in the red blood cells .
so if a person starts to intake cigarettes which contain high amounts of carbon monoxide ,it reduces oxyhaemogoblin formation because it binds very tightly to the haemogoblin .then carboxyhaemogoblin is formed and its permanent so causing reduction in aerobic respiration, and reduction in oxygen transport and causing damages to heart muscles.
Hope this helps if you need any more explanation feel free to comment in the comment section below !!!
explain the importance of dimensioning in biology
Answer:
Even if you make a drawing to scale, it would be difficult to determine the exact precision that is needed.
It would be time consuming to measure each of the lines to determine measurement.
The basis for modern part dimensioning is the need for interchangeable parts (being able to buy something off the shelf that fits what you already have)
Explanation
When dimensioning, it is good technique to avoid listing the dimension more than once through out the drawing.
If you need to list a dimension more than once, for accuracy or ease of viewing, you must encase the dimension within a set of brackets.
Answer:
The purpose of dimensioning is to provide a clear and complete description of an object. A complete set of dimensions will permit only one interpretation needed to construct the part. Dimensioning should follow these guidelines. Accuracy: correct values must be given.
Which food contains mostly polsaccharides
Answer:
food with carbohydrates
Explanation:
they comprises of two or more mono saccharides
Identify and describe how bacteria, hormones, and nerves influence the health and activities of the GI tract
Answer:
The GI health is supported by a varied and rich population of bacteria. The GI processes are controlled by the coordinated efforts of the hormonal system and the neurological system. Digestion and absorption together break up diets into bodily nutrients. A healthy GI system requires a balanced diet, sufficient relaxation, and frequent physical activity, to perform best.
Explanation:
Bacteria along the GI tract have a wide range of possible health benefits, including the production of vitamins, ion absorption (Ca, Mg, and Fe), pathogens protection, histologic development, improved immune systems, and fermentation of "no-digestible food" Bacteria have a number of potential functions.
During the digestion and absorption process hormones control the different digestive enzymes, which are secreted in the stomach and bowel. In reaction to the consumption of food, for example, the hormone gastrin induces stomach acid output. The somatostatin hormone prevents stomach acid secretion.
A water pipe bursting in the winter is a result of which type of weathering?
A. Biological
B. Exfoliation
C. Chemical
D. Freeze-thaw
Hurry!
Answer:
D
because water expands when it freezes
science please answer>:3
Answer:
1. Winter
2. Summer
3. greenhouse
4. global warming
A. Summer and monsoon
B. Greenhouse gases and global warming
C. Away and Towards
What is green house gases?
"The main greenhouse gases whose concentrations are rising are carbon dioxide, methane, nitrous oxide, hydrochlorofluorocarbons (HCFCs), hydrofluorocarbons (HFCs) and ozone in the lower atmosphere."
What is global warming ?
"Global warming is the long-term heating of Earth's climate system observed since the pre-industrial period (between 1850 and 1900) due to human activities, primarily fossil fuel burning, which increases heat-trapping greenhouse gas levels in Earth's atmosphere".
To know more amount green house
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‼️⁉️need answer ASAP ‼️⁉️Which property describes a mixture? Cannot be separated by physical methods. It has a Single Chemical composition. It cannot have more than one state of matter. It cannot be described by a chemical symbol or formula.
Answer:
Explanation:
id :- 257 473 5835 password:- 1234
Answer:
D.
Explanation:
Which process is responsible for causing menstruation
Explanation:
the process in a woman of discharging (through the vagina) blood and other materials from the lining of the uterus at about one monthly interval from puberty until menopause (ceasing of regular menstrual cycles).
A desert region would be most likely to experience what type of weathering?
A. Exfoliation
B. Biological
C. Sedimentary
D. Freeze-thaw
Answer:
C, Sedimentary
Explanation:
Sedimentary weathering is rocks that are the product of the erosion of existing rocks, most commonly occurring in a desert region due to the hot, dry weather, along with the many obvious rocks there.
Lipids and carbohydrates have many functions in the body of an organism. Specific lipids and proteins
perform specific tasks. Read the descriptions below to answer the following question: How are
triglycerides and glycogen similar in their primary function?
A. Both act as catalysts.
B. Both store genetic information for the organism.
C. Both support the structure of the organism.
D. Both store energy used by the organism.
Answer:
D. Both store energy used by the organism.
Explanation:
THREE USES THAT CELLS MAKE OF THE ENERGY RELEASED BY ATP
Answer:
ATP provides the energy needed for many essential processes in organisms and cells. These include intracellular signaling, DNA and RNA synthesis, Purinergic signaling, synaptic signaling, active transport, and muscle contraction.
Explanation:
what are chloro-fluoro carbons ??
explain !!!
Answer:
Chlorofluorocarbons are fully or partly halogenated paraffin hydrocarbons that contain only carbon, hydrogen, chlorine, and fluorine, produced as volatile derivative of methane, ethane, and propane.
Explanation:
What is produced during the Krebs cycle?
A. carbon dioxide
B. glycogen
C. oxygen
Links and random responses will be reported
Answer:
A. carbon dioxide
Explanation:
For one cycle, two molecules of carbon, three molecules of NADH, one molecule of FADH2 and one molecule of ATP or GTP are produced.
True or false? Recent genetic evidence indicates that there may be—in the roots of some plants—a response stimulated by the concentration of water in the soil.
Group of answer choices
False
True
I think it will be false only as I have readed in my sister book FALSE
Answer:
I think the answer is false.
Explanation:
I hope this helps
Glucose molecules provide energy to power the swimming motion of sperm. In this example, the sperm are changingA) chemical energy into kinetic energy.B) chemical energy into potential energy.C) kinetic energy into potential energy.D) kinetic energy into chemical energy.E) kinetic energy into thermal energy.
Answer:
A
Explanation:
The correct answer would be that the sperms are changing chemical energy to kinetic energy.
In order to power the movement of the sperm cells, chemicals in the form of glucose molecules are hydrolyzed and the resulting energy from the reaction is used to power the movement of the sperm cells. Moving sperm cells possess kinetic energy. Thus, we can say that the chemical energy in the glucose molecules is converted to kinetic energy in the sperm cells.
The correct option is A.
What would most likely happen to this ecosystem if all of the gray wolves were removed?
Answer:
D. The fox population would decrease
Explanation:
The food web shows that the gray wolves population are the only population that prey on the moose population. If the gray wolves were removed, the population of moose would increase significantly and would dominate the ecosystem. This means that other herbivores won't be able to compete with the moose population for the forages and vegetation in the ecosystem. The population of the other primary consumers/herbivores will reduce also. By implication, the fox which depend on other smaller preys to feed on would not have much prey to feed on. The ultimate effect of the removal of the gray wolves would lead to a later decrease in the population of the fox
A ______ is a circular band of muscles designed to prevent movement into or out of a body cavity or organ. Multiple choice question.
Answer:
sphincter
Explanation:
circular muscle that normally maintains constriction of a natural body passage or orifice and which relaxes as required by normal physiological functioning.