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Related Questions
Which best explains why sawdust burns more quickly than a block of wood of equal mass under the same conditions?
The molecules move more quickly in the sawdust than in the block of wood.
The pressure of oxygen is greater on the sawdust.
More molecules in the sawdust can collide with oxygen molecules.
Oxygen is more concentrated near the sawdust than the block of wood.
Answers
Which best explains why, under the same circumstances, sawdust burns more fast than a wood block of equivalent mass The molecules in the sawdust move more swiftly than those in the
A thermal burn is what?
An injury to the skin or other organic tissue known as a burn is one that is primarily brought on by heat, radiation, radioactivity, electricity, friction, or contact with chemicals. When hot liquids, heated solids, or flames come in touch with the skin and other tissues, part or all of the skin's cells are destroyed (flame burns)
What various sorts of Burns are there?
This tiny burn merely penetrates the skin's surface layer (epidermis). It might hurt and make you red. second-degree burn Both the epithelium and the next layer of skin are affected by this kind of burn (dermis). It could result in skin that is swollen, red, white, or patchy. The pain may become intense and blisters may form. Scarring may result from second-degree burns that are deep.
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Answer:
C.More molecules in the sawdust can collide with oxygen molecules.
Explanation:
real
How old is the sun?
Answers
Our little teenage Sun is nearly 4.6 billion years old.
PLEASE BE QUICK! Question 7 of 35
Why do scientists use microscopes to study cells?
A. Because most cells are too dangerous to view without protection
B. Because it is quite rare to find living things that are made of cells
C. Because most cells cannot be seen without magnification
D. Because cells can be studied only after they have died
SUBMIT
Answers
Answer:
C
Explanation:
Most are too small to be seen with the naked eye. so they must be looked at with a microscope
The answer is C) Because most cells cannot be seen without magnification
Without the proper tools, the naked eye will never be able to see a cell. But when you have the correct tools, you will be able to spot them, as long if you know what you are doing. Cells are too small for the naked eye to see, just like trying to find the needle in the haystack without touching it.
After researching the possible effects of music, Elaina proposes that if people listen to faster-paced music, their pulse rates will increase more than if they listen to slower music. Her mother listens to classic rock at a high volume for 30 minutes, her younger brother listens to classical music quietly while he sleeps at night, and her grandmother listens to two hours of rap at a medium volume. Elaina records each person's pulse before and after listening to the music. What is missing from Elaina's scientific investigation?
Answers
Answer:
Constant variables
Explanation:
Elaina's investigation lacked the critical ingredient of constant variables which are important components of every scientific investigation. In every research, there are 3 important variables, namely:
1. Dependent variables: the actual variable to be measured during the course of investigations and whose values are dependent on another variable (independent variable) supplied by the investigators.
2. Independent variable: one of the variables that are supplied by investigators whose values are often manipulated to see the kind of changes it will cause to the dependent variable.
3. Constant variables: other variables that are neither independent nor dependent but constant for all the various experimental groups in investigations.
Constant variable is the factor which is missing from the Elaina's scientific investigation.
Constant variable is a type of variable that does not change or remain constant in the experiment. Elaina has to keep the type of music same to all the individuals such as the rap music should be replaced by classical music. This variable should be maintained constant for all people who participated in the experiment, then we will obtain the right results from the experiment so we can conclude that constant variable is the missing factor.
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What happens to urchins if the oxygen percent concentration drops too low for an extended period of time?
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Answer:
Since sea urchins are picky, they are used as indicator organisms in public aquariums to determine if the system is functioning properly. This is because they are very "picky" about water quality. If the water is contaminated, the sea urchins will be the first to show signs of stress, spines laying down or falling off. Do use an aquarium filter and do clean up the day after feeding. Any metal exposed to the seawater will corrode and poison the tank. A dying sea urchin will often spawn out and rot out, causing the others in the tank to spawn and die as welll.
Explanation:
Few species could exist without oxygen. Both you and the Purple Sea Urchin would perish without oxygen. As a result, the respiratory system is necessary for most forms of life.
What is respiratory system?Respiratory system is defined as your body's organs and other breathing-related elements, which are used to exchange oxygen and carbon dioxide during breathing. The network of organs and tissues that aids in breathing is known as the respiratory system. The respiratory system also includes the muscles that propel your lungs.
Because sea urchins are fussy, they are utilized in public aquariums as indicator species to check whether the system is working properly. This is a result of their extreme "pickiness" about water quality. Sea urchins will be the first to exhibit indications of stress, such as spines laying down or falling off, if the water is contaminated. A dying sea urchin will frequently spawn out and decay, which will cause the other sea urchins in the tank to do the same.
Thus, few species could exist without oxygen. Both you and the Purple Sea Urchin would perish without oxygen. As a result, the respiratory system is necessary for most forms of life.
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what are the difference between DNA and RNA
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Answer:
There are two differences that distinguish DNA from RNA: (a) RNA contains the sugar ribose, while DNA contains the slightly different sugar deoxyribose (a type of ribose that lacks one oxygen atom), and (b) RNA has the nucleobase uracil while DNA contains thymine.
Why Darwin is known as father of evolution? Discuss how evidences against Darwinism led to formulation of modern evolutionary theory. Interpret its postulates in your words with relevant examples. (10 marks)
Answers
Answer:
Darwin was one of the greatest scientists who ever lived. He wrote the book 'The origin of species'. Darwin was known not only for the theory of evolution as we know it today, but also the foundation that biological sciences are based on. Darwin was very worried that people would reject his theory, so he collected a huge amount of evidence. He took evidence from the fossil record and from his own collections. He talked to animal breeders and animal collectors. He proved that the theory of evolution is based on the idea that all species are related and gradually change over time. His postulates is what gave him the title father of evolution
Postulates of evolution:-
1) Individuals within species are variable
2)Some of these variations are passed on to offspring
3)In every generation, more offspring are produced than can survive
4) The survival and reproduction of individuals are not random
The individuals who survive and go on to reproduce the most are those with the most favorable variation, and they are naturally selected.
Example:-
If an animal has to do the same task over and over again, it's body gradually changes to make the task easier. So if a deer reaches higher and higher into trees for food, day after day, it's neck will gradually stretch as it gets older.
If a deer's neck grows longer during it's lifetime, all it's babies will be born with long necks too.
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do both plant cells and prokaryotic cells have 70S ribosomes
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which fundamental units are involved in force do step Wise
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Force = ma
We know, the unit that the S.I. unit of mass is Kg.
We also know that a = (v - u)/t.
We know that v = d/t and u = d/t and the S.I. unit of t(time) is s.
We know that the S.I. unit of d(displacement) is m.
So, the S.I. unit of v is m/s and the S.I. unit of u is m/s and the S.I. unit of t is s.
So, the S.I. unit of a is m/s×s or m/s²
So, the unit of force is
(unit of m) × (unit of a)
= kg × (m/s²)
= kg.m/s²
=
[tex]kg \: m \: {s}^{ - 2} [/tex]
Or more simply,
F = ma
=> F = m{(v-u)/t}
Putting units,
Newton = kg[{(m/s) - (m/s)}/s]
=> Newton = kg{(m/s)/s}
=> Newton = kg(m/s²)
=> Newton = kg.m/s²
=> Newton = kg.m.(s^-2)
Describe the normal process of osteogenesis for compact and spongy bone using the three different types of bone cells and their functions
Answers
Answer:
Osteoblasts penetrate the disintegrating cartilage and replace it with spongy bone. This forms a primary ossification center. Ossification continues from this center toward the ends of the bones. After spongy bone is formed in the diaphysis, osteoclasts break down the newly formed bone to open up the medullary cavity.
First, you introduce to the parents the importance of karyotype test, by describing its ability to detect two broad categories of abnormalities in chromosomes, (1)______________________ and (2)_______________________. You provide a few examples of genetic disorders that can be caused by chromosomal abnormalities, such as (3)_________________________ and (4)_____________________. Some parents would like to know what is the main cause of these genetic disorders. Without going into too much detail, you explain to them that chromosomal abnormalities are usually caused by (5) ____________________ in meiosis I and meiosis II, when the homologous chromosomes or sister chromatids fail to separate during meiotic cell division.
Answers
Answer:
Abnormalities in Chromosomes
1. Numerical
2. Structural
3. Down Syndrome
4. Turner Syndrome
5. Disorder or Error
Explanation:
Numerical chromosome abnormalities occur due to extra or missing chromosomes. Structural chromosome abnormalities occur due to the irregular formation or rearrangement of the chromosomal DNA, normally called translocation. Down syndrome occurs with extra chromosomes, more than 46. Turnover syndrome results from partial or missing X chromosomes, less than 46.
Chordates have a chord in the back for support. In animals with vertebrates, the
chord itself becomes the
Answers
Answer:
1
Explanation:
A carrot would be an example of a _______ system
Answers
a carrotwould be an example of a top Root system
¿Qué nombres reciben los tejidos que dan
origen a los tejidos adultos de las plantas?
a. Tejidos diferenciados
b. Tejidos indiferenciados (meristemos)
c. Tejidos vegetales
Answers
Answer:
D
Explanation:
Pls help thank you
A group of geologists is about to start excavating a new area for fossils. The area they are working in is the side of a cliff. Describe two pieces of information they will most likely be able to discover about the fossils they will find.
Answers
Answer:
Forms of fossils and there arrangement with layer of rock.
Explanation:
The seashore is a significant place for the depositional work of waves and it's also one of the significant places for the erosion and weathering of rocks. The presence of sedimentary rocks along the cliffs are essential for the discovery of fossils of plants and animals. Fossils of shells and other creatures that were of marine origin are mostly discovered near excavation sites. Fossil helps to prove the age of rocks and strata.vai trò, cấu tại, thuộc tính của hợp chất thứ cấp
Answers
Hợp chất thứ cấp là các chất không có chức năng trực tiếp trong các quá trình đồng hóa, hô hấp, vận chuyển, tăng cường và phát triển thực vật. Chức năng chủ yếu của các hợp chất thứ cấp là bảo vệ thực vật chống lại các tác nhân gây bệnh và động vật ăn cỏ. Nhiều chất thứ cấp có hoạt tính sinh học mạnh được dùng làm chất diệt côn trùng, nấm, dược chất. Hợp chất thứ cấp được phân làm ba nhóm chính ở thực vật: Các terpen, các hợp chất phenolic và các hợp chất chứa Nitrogen.
why are cross section leaves placed in water immedietely are being cut
Answers
Answer:
Although the cuticle provides important protection from excessive water loss, leaves cannot be impervious because they must also allow carbon dioxide in (to be used in photosynthesis), and oxygen out.
Explanation:
In a diploid cell, a FISH probe should produce ____________ signals in metaphase FISH and ____________ signals in interphase FISH.
Answers
Answer: Four, two
Explanation:
FISH (fluorescence in situ hybridization) is a technique for chromosome mapping with probes that emit fluorescence and allow the visualization, distinction and study of chromosomes of nuclei in metaphase or inferophase. In this way, any type of anomaly such as inversions, aneuploidies, duplications or microdeletions can be seen. To do this, a non-specific DNA staining is performed with DAPI (a fluorophore that marks the nucleus where DNA is present) and the fluorescence will be seen under the microscope.
When cells are in metaphase, their chromosomes are condensed in preparation for cell division. To stop them in metaphase, colchicine is used which is a microtubule depolymerizing agent responsible for separating the sister chromatids of a chromosome, thus preventing the progression of cell division and arresting the cell cycle in metaphase. Here we will see translocations, microdeletions or duplications.
Interphase FISH is used to see decondensed chromatin, which allows higher resolution in detecting small abnormalities. It is mainly used for the detection of aneuploidies or large deletions, duplications or translocations when samples are difficult to grow or are scarce, as in the case of fetal or tumor cells. It is not possible to distinguish between a normal karyotype and a karyotype showing a balanced translocation. In addition, it can be used in the analysis of solid tumors, which divide very infrequently.
During metaphase, the chromosomes are duplicated so there would be two sets of chromosomes (a total of four chromosomes). Then, there would be four signals for each probe. During interphase, the chromosomes are not dupicated. Since it is a diploid organisms, there would be two chromosomes and this will represen two signals for probe.
choose the letter of the correct answer 1. Which one of the following is NOT an organic compound? a. Methane b. Carbon dioxide d. Lactic acid C. Oil
Answers
Answer:
B
Explanation:
The skin is protected by the action of cells that arise from bone marrow and migrate to the epidermis. Which cells serve this function?
Answers
Answer:
Langerhan's cells
Explanation:
The Langerhan's cells arise from the bone marrow and migrate to the epidermis. The Langerhan's cells are the body's first line of defense and play a significant role in antigen presentation. They need special stains to be visualized and are primarily found in the stratum spinosum. These are the mesenchymal origin obtained from CD34 positive stem cells of bone marrow and are part of the mononuclear phagocytic system.
In a test cross, a pure-breeding plant is crossed with a plant suspected to be heterozygous (Aa). What is the genotype of the pure-breeding plant?
Answers
Answer:
aa
Explanation:
In genetics, a test cross is a cross performed to determine the unknown genotype of a phenotypically dominant organism. The test cross is done by crossing the unknown genotype with a homzygous recessive organism. The result of this cross tell us whether the unknown genotype is heterozygous or homzygous dominant.
According to this question, a test cross was conducted involving a pure breeding plant with a plant suspected to be heterozygous (Aa). Based on the explanation of a test cross above, the genotype of the pure-breeding plant will be "aa". Note; it must be recessive.
Modelizar un ecosistema colocando los niveles tróficos y las relaciones en la red alimentaria
Answers
Answer:
Ejemplo ecosistema y su cadena trófica:
- Ecosistema: llanura (campo de maíz)
- Productor primario: plantas de maíz
- Consumidor primario: Ratones
- Consumidor secundario: Aves rapaces
- Microorganismo descomponedor: bacterias
Explanation:
En una cadena trófica o cadena alimentaria de un ecosistema, cada nivel obtiene la energía necesaria para sustentar la vida a partir del nivel inmediatamente anterior, mientras que los productores primarios son aquellos organismos que hacen ingresar la energía al ecosistema. Por otra parte, los descomponedores son organismos que se alimentan de los restos de animales y plantas, mediante su descomposición, obteniendo de ellos energía y materia hasta transformarlos en materia inorgánica. En el ejemplo arriba citado, las plantas de maíz representan los productores primarios los cuales producen energía y materia orgánica requerida para sustentar el ecosistema mediante el proceso de fotosíntesis. En segundo lugar, los ratones, como así también otros organismos herbívoros, representan los consumidores primarios los cuales conforman el segundo nivel trófico de la cadena alimentaria. En tercer lugar, los animales carnívoros que se alimentan de consumidores primarios (como por ejemplo, aves rapaces) representan el tercer nivel trófico, y así sucesivamente niveles superiores en el caso que existan depredadores mayores en el ecosistema. Finalmente, bacterias y otros organismos (por ejemplo, hongos, lombrices, algunos insectos, etc) representan los descomponedores los cuales se alimentan de restos orgánicos en descomposición, transformándolos de este modo en compuestos inorgánicos que ingresan nuevamente al ecosistema.
What kind of interaction does this image show, which acts as limiting factor on the fish?
A. mutualism
B. Parasitism
C. Commensalism
D. Predation
E. Exploitation competition
Answers
Answer:
Predation
Explanation:
The cat is the predator and the fish is its prey.
Answer:
predation
Explanation:
because
Which tool is a meteorologist most likely to depend on to collect information from the
upper atmosphere?
Answers
Answer:
Anemometer is the most likely meteorologist to collect information from the high atmosphere.
Explanation:
A device to measure wind velocity and direction is an anemometer. It's also a common meteorological tool. The name comes from the Greek phrase anemos that means wind and is used to designate any meteorological wind speed instrument.
Anemometer uses
The anemometer is used for the following purposes other than to measure the wind speed:
For wind pressure measurementIn order to measure wind flowMeasuring the wind directionIt is used to assess weather conditions before testing its gadgets by drone users or RC aircraft usersUsed also by snipers and pilots of long-rangeSkydivers are used to assessing wind speed before they spring into the abyss.Used to measure airspeed in aerodynamicsAnswer:
weather balloon
Explanation:
the flowers of the ____ bloom with sunrise and close with sunset.
Answers
The ABO locus for blood typing consists of three alleles, A, B and i. An analysis the ABO blood types in the population of the Pingelap atoll of Micronesia is being planned. A Chi-Square analysis is being planned as part of the data analysis. How many degrees of freedom are there in the experiment
Answers
Answer:
1/8(12.5) if the answer is correct plz mark me as brainliest.
A white colony growing on mannitol salt agar tests negative for coagulase and novobiocin sensitivity. This bacterium is most likely ________________
A white colony growing on mannitol salt agar tests negative for coagulase and novobiocin sensitivity. This bacterium is most likely ________________
Streptococcus pyogenes.
Staphylococcus epidermidis.
Stpahylococcus saprophyticus.
Staphylococcus aureus.
Answers
Answer:
for the first it is Staphylococcus saprophyticus. and for the second it is Streptococcus pyogenes.
Explanation:
Answer:
1. Staphylococcus aureus.
2. Staphylococcus epidermidis.
Explanation:
Question 9
What is the main difference between a prokaryote and eukaryote cell?
Answers:
The presence of a cell wall
The presence of genomic DNA
The absence of genomic DNA
Crossing over
The absence of a cell wall
Question 10
Answers
Answer:
Crossing over
Explanation:
Prokaryotic cells are cells that do not possess a membrane bound nucleus to house their genetic material e.g bacteria while eukaryotic cells possess a membrane bound nucleus that houses their genetic material e.g plants.
One important characteristics of prokaryotic cells is that they do not undergo any form of sexual reproduction, hence, cannot undergo MEIOSIS, which only occurs in sexual reproducing organisms. Prokaryotes reproduce asexually by binary fission.
Crossing over is a unique process that only occurs during meiosis. Since prokaryotic cells do not undergo meiosis, this means that crossing over is the difference between prokaryotic cells and eukaryotic cells in this question.
Which of the following is a process that is prompted by a question?
A. Conclusions
B. Observation
C. Measurement
D. Inquiry
Answers
Answer:
D
Explanation:
Should be correct I guess.
What is an office what is an office
Answers
Answer:
Explanation:
An office can be referred to a building or rooms or a room which is arranged and set up with furnitures and things needed for commercial use or professional work to achieve a goal.
An office is also refered to position of authority occupied by someone to perform some tasks.
Answer:
here's your answer
Explanation:
The office helps in controlling the activities of different people and department of an organisation. Through controlling it ensures that the various activities of business are performed with much accuracy. Memory Center: Office protects important information of past in a safe manner.