A. to become extinct over time
30 !!!
Around each electron that orbits an atom's nucleus ______.
A) a magnetic field
B) an electric current
C) a positive charge
D) a negative charge
Answer:
the answer is D) a negative charge
Answer:
a negative charge
Explanation:
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Which of the following are functions of the reproductive organs in animals?
I. Produce sperm
II. Support the body
III. Protect the internal organs
IV. Make the eggs
I and II
II and IV
I and IV
II and III
Answer:
c
Explanation:
I and IV are the functions of the reproductive organs in animals.
What are Reproductive organs?
The female reproductive system serves a number of purposes. It aids in sexual reproduction in addition to enabling sexual activity.
The fertilized egg is then transferred to your uterus, where the lining has expanded due to the regular hormones produced during your menstrual cycle (also called your reproductive cycle).
The fertilized egg can implant into the thicker uterine lining once it's within your uterus and continue to grow there. Your menstrual period causes the uterine lining to shed if implantation doesn't occur. The female reproductive system also creates sex hormones that keep your menstrual cycle regular.
Therefore, I and IV are the functions of the reproductive organs in animals.
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Please give me the correct responses.Only answer if you're very good at science/biology.Please don't put links to websites or else I'll report you.
Scientists believe Polar Bears have evolved from a group of Brown Bears that became an isolated population during a time when the Earth's climate began cooling down.What are some adaptations that make Polar Bears different from Brown Bears and what do you think caused the adaptations to occur?
Answer:
One adaptation is white fur. There was probably one white cub born to a brown bear mother, and the fur helped camouflage it for safety and later, hunting. This bear would have been more successful in hunting in the arctic, so it was more likely to reproduce and pass on the white fur genes. A second adaptation is the long claws of brown bears that are used for digging through vegetation would have shortened to be safer on ice. Polar bear paws also have little sticky bumps on their paws for gripping ice.
A third adaptation is that polar bears don't hibernate in winter. In winter, there is a lot more food available to them, so they need to stay awake. A fourth adaptation is their hair is also now water repellent, because most of their food comes from the sea. A fifth adaptation is in their digestive system. Polar bears don’t digest carbohydrates as well as brown bears, because their diet has much more fat than anything else. Polar bears hunt seals and can convert the blubber into fat for their bodies to live off of when food is scarce.
Consider a population that contains black and white cats where the black allele (B) is dominant and the white allele (b) is recessive. Indicate whether each statement is true or false.
1. Evolution is occurring in a population of cats where the genotype frequencies of BB, Bb, and bb are 0.64, 0.32, and 0.04, respectively.
2. A population of cats is in Hardy-Weinberg equilibrium when the genotype frequencies of BB, Bb, bb are 0.49, 0.33, and 0.16, respectively.
3. Evolution is occurring in a population of cats where the genotype frequencies of BB and Bb are 0.7 and 0.2, respectively. _____
4. A population of cats is in Hardy-Weinberg equilibrium when the genotype frequencies of BB and Bb are 0.25 and 0.5, respectively. _____
Answer:
what is this what subject
give three example of fungi
Answer:
Yeasts
mold
mushrooms
Explanation:
All of the following are complications that can result from an individual suffering from an eating disorder except
A heart disease
B. dieting regularly
C. kidney damage
D. death
Answer:
The answer is B
Explanation:
Hope this helps
Answer:
B. dieting regulraly
Explanation: correct on edge 2021
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_____% of species present during the Permian survived into the Triassic.
Answer: 30
Explanation:
List advantages and disadvantages of using scientific models.
Answer:
Explanation:
disadvantages:
Models do not behave exactly like the things they represent. Accuracy—In order to make models simplistic enough to communicate ideas some accuracy is lost. For example, ball and stick models of atoms do not show all the details that scientists know about the structure of the atom.
advantages:
When students are engaged in scientific modeling, they are able to notice patterns and develop and revise representations that become useful models to predict and explain--making their own scientific knowledge stronger, helping them to think critically, and helping them know more about the nature of science.
The advantage of a scientific model is it allows complicated processes to be predicted and simplified. A model's drawback is that it could be deceptive and open to numerous interpretations.
What is a scientific model?The advantages are:
Students who participate in scientific modeling are better able to identify patterns and create and revise representations that become useful models to predict and explain, strengthening their own scientific knowledge and fostering critical thinking. They also gain a better understanding of the nature of science.The disadvantages are :
Models don't always act the same as the things they're meant to represent. Accuracy—Some accuracy is lost when models are simplified to the point where they can convey concepts. For instance, the specifics that scientists are aware of regarding the structure of the atom are not depicted in full by ball and stick representations of atoms.Thus, the advantage and disadvantages are written above.
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1. Which of the following events is not a source of genetic variation in eukaryotic organisms?
J. Mutation
K. Independent assortment
L. Mitosis
M. Fertilisation
2. Which statement best describes the process of endocytosis?
J. A vesicle within a cell fuses with the plasma membrane and releases its contents to the outside
K. Solid particles or liquid are taken up by a cell through invagination of the plasma membrane
L. Investment in one cytosis reduces the ability of the parent to assist another cytosis
M. One region of an embryo directs the development of neighbouring region of an embryo through movement of cells
3. In eukaryotic cells the conversion of ADP and phosphate into ATP occurs (KA1)
J. only in the mitochondria, and requires energy.
K. only in the cytoplasm, and releases energy.
L. in both the mitochondria and the cytoplasm, and requires energy.
M. in both the mitochondria and the cytoplasm, and releases energy.
4. One consequence of having small regulated steps in an energy pathway is (KA1)
J. an increase in the activation energy for the pathway.
K. a decrease in the amount of heat lost from the pathway.
L. a decrease in the amount of ATP released from the pathway.
M. an increase in the total energy released from the pathway.
5. Adult stem cells in bone marrow can differentiate into a variety of cell types e.g brain, skin, lungs, heart, liver and muscle.
Stem cells that are transplanted from a healthy donor into a patient (recipient) will divide and differentiate into cells of like form and function to the surrounding cells.
The adult stem cells from the bone marrow of the donor would be genetically identical to the cells of the
J. recipient, and divide by mitosis.
K. donor, and divide by mitosis.
L. recipient, and divide by meiosis.
M. donor, and divide by meiosis.
Answer:
1. Mitosis
2. K. Solid particles or liquid are taken up by a cell through invagination of the plasma membrane
3. L. in both the mitochondria and the cytoplasm, and requires energy.
4. J. an increase in the activation energy for the pathway.
5. K. donor, and divide by mitosis.
Explanation:
The sources of genetic variation in a population with sexual reproduction are 1-mutation, which can be defined as genetic changes in the genome of an organism that create new alleles in the population, 2-independent assortment, where pairs of homologous chromosomes are randomly separated, during meiosis, 3-fertilization, where two gametes held together to form the zygote cell (thereby creating new genetic combinations), and 4-recombination or crossing over (i.e., the exchange of genetic material between non-sister chromatids during meiosis). Endocytosis is a cellular process by which substances enter into the cell by invagination of the cell membrane (this term is contrary to exocytosis). In eukaryotic cells, mitochondria are organelles whose membranes produce ATP from ADP and Pi by aerobic respiration (i.e., by the Krebs Cycle and electron transport chain), while glycolysis occurs in the cytoplasm. This process requires the addition of energy (chemical energy in the form of organic compounds). An energy pathway that has many small regulated steps is expected to produce intermediate products and increase its activation energy. Finally, stem cells that derive from a donor and are genetically identical it is expected that divide by mitosis.
Question:
Using a specific example, discuss the importance of electrons in the transfer of energy in living systems.
Answer: The transfer of energy in the form of electrons allows the cell to transfer and use energy in an incremental fashion. The principle electron carriers are NAD+ and NADH because they can be easily oxidized and reduced, respectively.
Explanation:
Electrons are very significant in the steps of energy transfer in the living body cells.
When the electrons are displaced from the molecule it gets oxidized which results in a reduction in the potential energy.
Electrons transfer is very important because most of the power is stored in the atoms in the form of electrons that are required for cell functioning.The chief electron transporters are NADH and NAD⁺ they reduce and oxidizes the compounds.NAD⁺ is oxidized and NADH is the reduced form of the molecules.The living structures cannot save a large amount of energy and hence they collect them in the form of ATP and electrons.To learn more about the importance of electrons in living organisms follow the link:
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2. Name one positive benefit of having vertebrae for Chordates
1. Explain where most of your food originally came from and how your cells obtain and use that food.
Answer:
the food that we eat are used up by the cells to perform different activities such as metabolism.
which of the following are parts of the biosphere. choose all that apply
river
deer
tree
mountain
mushroom
Which type of macromolecules helps a cell brake down food?
Answer:
amylase, sucrase, lactase, or maltase.
Explanation:
this is because of proteins are always broken down by the the enzymes pepsin and peptidase, and by hydrochloric acid.
Sexual reproduction results in offspring that are *blank*
from both parents?
A. different
B. same
C. opposite
D. none of these
Answer:
I would put unique but since that's not a choice, probably different
Explanation:
Answer:
A. Different
Explanation:
In sexual reproduction, the offspring inherits traits from both parents. They are not an exact copy of either but have traits from both. Hope it helps :)
100 POINTS! AND GIVE EXPLANATION!
a student made this model of carbon dioxide moleclue. it has one carbon atom and two oxygen atoms what is the correct way to write carbon dioxide the chemical name for
A: C2O
B: C²O
C: CO2
D: CO²
Answer:
CO₂
Explanation:
In chemistry we use subscripts after the element represented by that amount.
Answer:
C: CO2
Explanation:
Carbon has four valence electrons. Oxygen needs two valence electrons to become stable. A carbon dioxide molecule is a combination of one carbon atom and two oxygen atoms, CO2. Because carbon dioxide includes two different elements, it is a compound as well as a molecule.
Hope this helped!!!
How might a wildfire influence mass wasting? By drying out (removing the water) from the regolith on a slope, wildfires decrease the likelihood of a mass wasting event. A wildfire can dry out the regolith on a slope, making it less cohesive and more likely to travel downward. Wildfires burn only at the bottom of a slope, which oversteepens the slope and induces mass wasting. The ash from the wildfires lands on the slope, adding enough mass to instigate mass wasting. Because plants on a slope bind the regolith with their roots and shield the soil surface from raindrops, a wildfire that destroys these plants would render the soil looser and more susceptible to the erosional forces of rain.
Answer:
Because plants on a slope bind the regolith with their roots and shield the soil surface from raindrops, a wildfire that destroys these plants would render the soil looser and more susceptible to the erosional forces of rain.
Explanation:
The plants present in a region, protect the soil from being eroded by the impact of rain or wind. This is because the roots of the plants leave the soil more aggregated, block the impact of the wind and allow water to infiltrate. This protection is increased on slopes, where the chances of erosion are greater. However, when a fire occurs and these plants are killed, the roots no longer provide protection to the soil, leaving it drier and looser. This causes the wind to break this soil apart, facilitating erosion. In addition, rainwater has difficulties in infiltrating the soil and ends up draining, taking parts of the soil with it and causing erosion.
describe how the mammalian heart is adapted to it's function
Answer:
The ventricles are thick walled; to pump blood to the lungs and the rest of the body. The left ventricle has thicker wall to create more pressure because it pumps blood for longer distances round the body; while the right ventricle pumps blood to the lungs close to the heart.
There are more than 300,000 species of plants that have been identified thus far in the world today; many new species are being discovered each year. In addition to providing most of the oxygen for land animals, plants do many other things for us. you will research the Internet and use reliable and credible scientific websites to investigate a specific plant species and choose a way (other than providing oxygen) that plants are useful to humans. [NOTE: Hot topic plants like Marijuana and Opium are off limits and cannot be discussed.]
Writing a full paragraph (a 150-words minimum) for your initial blog post discussing a specific species of plant and the benefit you chose. Be sure to describe what type of plant it is. Where is it found? How does it impact humans or other species? What role does it play in the ecosystem, etc.?
Answer and Explanation:
We can mention the advantages of the plants of the Fabaceae family, also known as legumes, such as beans, soybeans, peanuts and peas. First, we must mention how these plants have high nutritional values providing high levels of iron and nitrogen that are essential elements for human health. However, a benefit that these planats produce and that is important on a worldwide scale is the fixation of nitrogen in the soil. All living beings need nitrogen in their bodies, since nitrogen is a primary element in the composition of nucleic acids and proteins. Animals are able to ingest nitrogen from the vegetable diet, but vegetables cannot absorb nitrogen from the atmosphere or nitrogen from the soil, because they are not in molecular forms that plants can absorb. To reverse this, farmers put chemical fertilizers on the plantations, but these fertilizers pollute the environment intensely. It is in this scenario that the plants of the Fabaceae family are important. This is because these plants are able to associate with bacteria that can capture atmospheric nitrogen and place it in the soil, in the molecular form that all plants can absorb. This allows plants to have the necessary nutrients for their growth, reduces environmental pollution, decreases spending on agricultural production, promotes correct levels of nitrogen for human consumption and allows agricultural products to be healthier.
What happens if the mass of the elements is greater compared to smaller ?
Hello. More information is needed to answer your question accurately. However, I will try to help you in the best possible way
If you are referring to what happens if the mass of an atom is greater compared to an atomic number, we can say that there is nothing too much, since it is normal for the atoms to have a mass slightly greater than the atomic number. The mass of an atom can never be less than the number of protons added to the number of neutrons. An atom with greater mass has a greater number of electrons and neutrons in relation to an atom of less mass and it is likely that the atom of less mass will donate or share electron with the atom of greater mass so that both reach the electric balance.
The table below shows the average distances of four planets from the sun.
Considering Kepler's Laws, which planet has the fastest average orbital speed?
A. Venus
B. Neptune
C. Saturn
D. Jupiter
Answer:
Venus
Explanation:
The closer a planet is to the Sun the faster it moves because the Sun can exert more gravitational force on it. Venus is the second closest planet to the Sun therefore the fastest out of the options.
Its Venus.
It is closer to the sun than the other planets on here.
what are some similarities for prophase and telophase
Answer:
Both prophase and telophase have a complete set of chromosomes and organelles.
How do invasive species usually affect the availability of natural resources in an ecosystem?
PLEASE HELP ME
Answer: Invasive species can harm both the natural resources in an ecosystem as well as threaten human use of these resources. ... Invasive species are capable of causing extinctions of native plants and animals, reducing biodiversity, competing with native organisms for limited resources, and altering habitats.
Explanation:
Any mutation that affects just one base is called a -?- mutation.
Answer: A point mutation is when a single base pair is altered. Point mutations can have one of three effects. First, the base substitution can be a silent mutation where the altered codon corresponds to the same amino acid.
Explanation:
6. Hawks have eyes that alow them to see prey from very far away. Which of the following
terms best describes this trait?
A vestigial organ
B. adaptation
Coverproduction
D artificial selection
Which of the following scientists are accredited with discovering DNA?
Group of answer choices
Einstein
Watson and Crick
Gregor Mendel
all of these
Answer:
Watson and Crick
Explanation:
Describe your plan for how light intensity might affect the rate of photosynthesis? Help please I would really appreciate it
Which type of macromolecules helps a cell brake down food? Lipids proteins carbonhydrates or nucliec acids
Answer:
The correct answer is - proteins.
Explanation:
All the food particles are broken down by specific protein molecules called enzymes. Carbohydrates are the macromolecules that are broken down by enzymes; amylase, lactase, sucrase, or maltase.
Proteins are macromolecules that are broken down with the help of the enzymes peptidase, pepsin. Lipids macromolecules are also broken down by lipase enzymes. Breakdown of these macromolecules provides energy for cellular activities.
describe the mass and charge of particles you find in the nucleus and in the electron cloud.
Proton is the positively charged particle with a charge equivalent to 1.6×10−19C .
Neutron is a neutral charged particle i.e. zero charge.
Electrons are negatively charged particle with a charge equivalent to −1.6×10−19C .
Protons and Neutrons are inside the nucleus of an atom and contribute to the most of the mass of the atom. Electrons are revolving around the positively charged nucleus in quantized energy shells.
"What do the four genotypes inside the 4 boxes of a Punnett Square represent?
Answer:
They represent the percent chance to inherit a type of genotype. Recessive alleles, dominant alleles, heterozygous have chances to appear based off the parent alleles.