Answer:
How has a polar bear adapted to its Arctic environment? Their white fur helps them blend in with the snow and ice. A polar bear has a layer of fat under its skin which helps it stay warm. It also has a thick layer of fur.Inhabiting the ice and sea of the Arctic, polar bears are well-equipped for survival in a harsh environment. Two coats of fur and a thick layer of blubber help insulate the polar bear's body from the cold, keeping its temperature at an even 37° C (98.6° F).
Polar bears have thick fur, a layer of blubber, and a white coat that helps them survive in polar regions. These features provide insulation, store energy, and offer camouflage. Their ability to generate heat further aids in maintaining their internal temperature.
Adaptations of Polar Bears to Cold Climates
Polar bears (Ursus maritimus) have several adaptations that allow them to thrive in extremely cold polar areas. These adaptations include:
Thick fur: Polar bears have a dense layer of fur that traps heat close to their bodies, providing insulation against the cold. The outer layer of fur is waterproof, preventing them from getting wet and losing body heat.Layer of blubber: Underneath their skin, polar bears have a thick layer of fat known as blubber. This blubber not only stores energy but also provides additional insulation to keep them warm in the icy environment.Heat generation: Like all mammals, polar bears generate heat through metabolic processes to maintain a stable internal temperature, essential for surviving in cold climates.White fur: Their white fur helps them blend into their snowy surroundings, serving as camouflage to protect them from predators and assist in hunting prey.Thanks to these incredible adaptations, polar bears are well-equipped to survive and thrive in their Arctic ecosystem.
In an experimental investigation, the variable that the researcher changes or manipulates in order to see its effects is called
Answer:
Test group is a group that is modified or changed by the researcher and is then compared to the experimental group while carrying out an experiment.
Explanation:
While observing the data of the test group, it has to be compared with the control group to see if there is any effect of the treatment on the test or not. The control can be positive or negative or both to which the test group is compared.
Answer:
independent
Explanation:
i did test on edge
Why do sodium ions need channels in order to move into and out in f cells?
Answer:
Firstly they are too big to pass through the natural pores of the cell membrane the way water molecules do through aquaporins. Secondly, they would not pass through the hydrophobic layer of the cell membrane because the sodium ions are charged. This is because the hydrophobic layer does not interact positively with charged molecules/ions. Additionally, because sodium ions would be traveling up the concentration gradient into the cell, there is need for active transport. The channels proteins are able to harness energy from ATP to actively transport the sodium ions into the cell.
Final answer:
Sodium ions require sodium channels to enter or exit cells because they can't diffuse through the hydrophobic cell membrane due to their charge. Sodium channels facilitate the movement of Na+ ions without the cell using energy; this is important for nerve signals, muscle contraction, and ion balance.
Explanation:
Sodium ions (Na+) require special structures known as sodium channels to move into and out of cells. These channels are necessary because sodium ions are charged particles and cannot diffuse through the hydrophobic (nonpolar) interior of the cell membrane. The lipid bilayer of the membrane acts as a barrier to charged substances, which means that ions like sodium cannot cross it without help.
Sodium channels are protein complexes that span the membrane, creating a pathway that allows Na+ ions to move down their concentration gradient, facilitated by the structure of the channel without the cell expending energy, a process known as facilitated diffusion. This movement is crucial for various cellular functions, including the generation of electrical signals in nerve cells, muscle contraction, and maintaining the overall ion balance within the cell.
The sodium-potassium ATPase is another crucial membrane protein that uses energy to move potassium ions (K+) into the cell while pumping sodium ions (Na+) out, creating an electrochemical gradient. Potassium channels, which are open most of the time, allow K+ to diffuse out of the cell to maintain the gradient. The difference in ion concentration on either side of the membrane is essential for many cell functions.
Turn the following statement into a
hypothesis using the "if, then" format.
"Sally is hungry when she eats a snack."
Answer:
If Sally is hungry then she eats a snack.
Explanation:
This is basically like cause and effect. If this certain thing happens, then this will happen.
Answer:
The correct answer will be- " If sally feels hungry, then she eats a snack".
Explanation:
A scientific hypothesis is a predicted statement proposed which explains the natural event to a limited extent. A hypothesis is based on the previous research work so is considered as the educated guess.
A hypothesis is designed in a way that it can be proved or disproved through the experiment so it should contain the variables which could be tested.
In the given question the proposed hypothesis will be-" If sally feels hungry, then she eats a snack" which shows the variables which can be tested.
What is biosphere????
The biosphere is any livable space on Earth.
So any space on Earth that can support
life is considered part of the biosphere.
For example, humans are part of the
biosphere since we are living on the Earth.
Select all that apply. What are the nutrients needed for good health?
carbohydrates
sugars
minerals
lipids
vitamins
proteins need some help ill mark as brainliest
Answer:
vitamins prteins minerals
Explanation:
vitamins proteins and minerals
What is not a function of the skeletal system?
A.) providing movement
B.) storing minerals
C.) making vitamins
D.) protecting organs
Which level of cellular organization is the most complex?
A.cells
B.organelles
C.organs
D.tissues
The most complex cellular organization is actually the organisms but since its not on the choices its the organs.
The most complex level of organization is the organ level. Details about level of organization can be found below.
What is level of organization?The level of organization of life refers to the hierarchical arrangement of the components that make up life.
The level of organization is from the most simple level to the most complex level as follows:
OrganellesCellsTissuesOrgansSystemsOrganismThis means that the most simple is organelles and the most complex is organism.
Therefore, the most complex level of organization in the options is the organ level.
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What atom is a carbon atom?
Please help ASAP will give brainliest
Answer:
B
Explanation:
The carbon atom has 6 electrons. 4 of which are valence electrons.
Answer: b
Explanation: there is four on the outer layer than middle later consist of 2 on the inside!
why does biomagnification has a larger impact on organisms at the top of
the food chain.
Answer:
Biomagnifications largely affects the organisms at the highest trophic level.
Explanation:
The increase in concentration of toxic chemicals while moving up in a food chain is called biomagnification. What starts out as a small concentration at the lowest trophic level turns out to become a higher concentration at higher trophic levels.
Thus it is the organisms at the highest trophic level that are the most affected. This accumulation occurs because the organisms have not evolved enough to posess mechanisms that facilitate detoxification of various substances.
Such substances are called novel substances and DDT is an example. Removal of substances like metals is also difficult. Thus a harmful chemical component travels up various trophic levels increasing in concentration at each trophic level.
Final answer:
Biomagnification results in higher concentrations of toxins in apex predators because they accumulate all the toxins present in the organisms they consume at lower trophic levels.
Explanation:
Biomagnification refers to the increasing concentration of persistent, toxic substances in organisms at each successive trophic level within a food chain. This phenomenon occurs because the toxins accumulate in the bodies of organisms, and when these organisms are consumed by predators, the toxins are transferred and magnify in concentration.
Notably, at the apex of the food chain, organisms such as swordfish have a higher concentration of toxins like mercury because they have ingested all the toxins accumulated in the bodies of organisms at lower trophic levels over time. Consumers of these top predators, including humans who consume fish like tuna or swordfish, consequently face a greater risk of toxic exposure due to the high levels of mercury and other persistent substances that have biomagnified through the food chain.
Place the stages of a high-mass star's life cycle in the correct order, from a star's birth to its death.
supernova
protostar
nebula
neutron star
Supergiant
Answer:
Nebula --> Protostar --> Supergiant --> Supernova --> neutron star
Explanation:
A high mass star starts as a big cloud of dust and gases. This cloud is called a nebula. When these clouds pick up some momentum, it condenses into a protostar.
The protostar will continue to condense because of its increasing gravity. The hydrogen atoms will start to collide and the pressure and temperature will trigger nuclear fusion. This is when the start will enter its main sequence where the outward force of nuclear fusion is balanced with its inward force. It will remain at this state until it runs out of hydrogen atoms.
When hydrogen stats to run out, the gravitational force will be greater than the force of nuclear fusion causing the core to shrink. Nuclear fusion then will start to occur outside the core and the star then expands into a Super giant.
The expansion of the star enables the star to create heavier elements like helium which then undergoes fusion itself and becomes a source of fuel for the star. When helium slowly depletes, it pulled into the core by gravity and all that is surrounding the core will explode , making it a super nova which marks the end of a star.
Two things can result from a supernova, a neutron star or a black hole. For bigger stars, the result would be a black hole. If the mass of the star was at least three times greater than our sun, then it will implode and become a black hole. If it is less, then the core would form a neutron star.
Answer:
nebula ---> prostar ---> supergiant ---> supernova ---> neutron star
Explanation:
I just did the assignment on edge 2022.
What type of transport does not require energy to move molecules across the plasma membrane?
concentration gradient
passive
bilayer
active
Answer:
Passive transport
Explanation:
Passive transport can easily be described as transport of atoms, molecules or ions across the cell membrane without requiring energy. The capability of a system towards growing in entropy is the reason that passive transport does not require any cellular energy, unlike the active transport. The permeability of the cell membrane depicts the rate of transfer of molecules, ions or atoms by passive transport, into and out of the cell.
Answer:
I just did the test and answer is passive transport
Explanation:
1.
Which organelle is present in the cells of a mouse but not
present in the cells of a bean plant?
A. cell wall
B.
chloroplast
C. cell membrane
D. centriole
Answer: Centriole
Explanation:
Centriole is the only cell organelle which is found in the animals cell but not in plant cell. The centriole is a cylindrical organelle which is composed mainly of the protein known as tubulin.
They are mostly found in the eukaryotic cells. It is absent in the plant cell.The centrioles are very important for the cell division and they produce microtubules which gets separated into two identical cells.
Hence, the correct answer is option D
The cell organelle that is present in the cells of a mouse but not in the cells of a bean plant would be the centriole. The correct option would be D.
Plant cells such as the ones in a bean plant have cell wall, chloroplast, and cell membrane. However, centrioles are only found in animals cells.
Centrioles in animal cells such as the one in a mouse functions as the basal bodies of spindle fiber, cilia, and flagella from which the spindle apparatus springs from during mitotic cell division. The spindle apparatus helps to organize microtubules during the mitotic process.
Plant cells have rigid cell walls that can organize microtubules during mitotic divisions. Hence, centrioles are not needed.
More on the functions of the centriole can be found here: https://brainly.com/question/11698407
HELP! True or false. A closed switch mans the electricity can flow freely through the circuit.
Answer:
True
Explanation:
An electric current can
only flow when there is
a closed path in which
electrons can move.
Which chemicals were formed in the brownish liquid in the flask and why was this significant?
Answer: The Miller-Urey Experiment
He based his calculations on the (then) widely held view that the early atmosphere was reducing, and concluded that the main constituents were methane (CH4), ammonia (NH3), hydrogen (H2), and water (H2O).
The brownish liquid in a reaction could be significant due to its role in demonstrating chemical change, as in the historical production of Cadet's fuming liquid, or in an educational setting, such as the reaction of a copper penny with nitric acid to form nitrogen dioxide.
Explanation:The brownish liquid in the flask which was formed by a chemical reaction is significant as it represents the transformation of substances through chemical change. If we refer to the historical context of Cadet's fuming liquid, it was accidentally produced by the French chemist Louis Cadet in 1760 when he was working on inks by heating arsenic oxide and potassium acetate, producing a red-brown oily liquid. This discovery was key in showing chemical synthesis and the potential hazards associated with chemical reactions, given the toxicity of the compounds involved.
In the educational setting, the generation of a brownish vapor observed when a copper penny is reacted with nitric acid signifies that a chemical reaction such as the formation of nitrogen dioxide, a brown gas, is occurring. This reaction demonstrates the principles of chemical reactions and their products. Furthermore, understanding these reactions allows insight into more complex processes such as those occurring within the human body, as every living organism is a complex system of ongoing chemical reactions.
Need help with this ready to eat foods includes
Answer:
the answer is A
Explanation:
What type of force is applied on a football to move it forward?
Answers are
Balanced force in backward direction
Unbalanced force in forward direction
Non contact force in backward direction
Gravitational force in downward direction
Btw im in FLVS
Answer:
B. Unbalanced force in forward direction.
Answer:
B. Unbalanced force in forward direction.
Explanation:beacause idid that test
what are 3 ways that compounds and mixtures differ
Answer:
3 ways to understand the differences between compounds and mixtures are described below in explanation.
Explanation:
1. In a mixture, no new product is formed. It is a simple tacking of two molecules without any chemical reaction occurring. For example water and sand. Compound is a new substance formed by chemical reactions occurring between various molecules. For example, carbon and oxygen combine to form carbon dioxide.
2. A compound is always homogeneous whereas a mixture can be homogeneous or heterogeneous.
3. Compounds have a fixed boiling and melting temperature. Whereas, mixtures do not have a definite melting and boiling temperature.
what is the correct MLA format for a works-cited page entry for a magazine article?
Explanation:
First do the Last, First, Then middle names of the author(s). Then the title of the article, then magazine. after that the date it was published and finally the page number the information was found on. example: Last, First Middle "title of article" title of magazine
What company owns much of the bottled water industry
Answer:
nestle
Explanation:
What was the benefit of crop rotation?
A. More land was needed to plant crops.
B. Different crops could be grown on the same land.
C. Crops could be separated into different fields.
D. Land could remain unplanted for long periods of time.
Answer:
B. Different crops could be grown on the same land.
Explanation:
Crop rotation is the process of growing different plants in the same land according to the season. Various kinds of plants require various sorts of supplements from the soil.
Changing crops on a regular basis enables the land to stay rich in nutrients, since not the majority of similar nutrients are being utilized each season. Crop rotation likewise fights against the powers of soil erosion. It also helps to improve the stability of the soil by shifting back and forth between harvests with profound roots and those with shallow roots.
(EASY) answer the question below!
Answer:
Photosynthesis!
Explanation:
This process uses carbon dioxide, or CO2, to create sugar, which is energy!
Answer:
C) photosynthesis is the process by which producers in an ecosystem convert light energy into chemical energy
Which famous scientist is credited as the founder of the scientific method?
Aristotle
John Dalton
Sir Francis Bacon
Sir Isaac Newton
Answer:
Sir Francis Bacon
Explanation:
because Sir Isaac Newton was famous for his mathmatics skills and many more, but the did not the founder of the scientific method, it is said that Sir Francis Bacon :), funny name created the scientific method "if sufficiently clever men discussed a subject long enough, the truth would eventually be discovered." he decided to challenge this by argureing the truth and doing experiments to get the evidence he needed the real world.
hope this helps
Which organ is part of the Integumentary system?
lungs
skin
stomach
heart
Answer: Skin
Explanation: The Integumentary system is made up of the skin, hair, nails, and exocrine glands. The only option within this list is skin and the answer is therefore skin.
how does the heart pumps blood to the body?
Answer:
Explanation:
It also carries away waste. Your heart is sort of like a pump, or two pumps in one. The right side of your heart receives blood from the body and pumps it to the lungs. The left side of the heart does the exact opposite: It receives blood from the lungs and pumps it out to the body
Answer:
Blood flows through your heart and lungs in four steps: The right atrium receives oxygen-poor blood from the body and pumps it to the right ventricle through the tricuspid valve. ... The left ventricle pumps the oxygen-rich blood through the aortic valve out to the rest of the body.
"Which is a characteristic of atoms?
They come in ten major types.
They are the smallest units of matter,
They can be divided,
They cannot combine together,
they are the smallest units of matter bebe:)
Answer:
The correct answer is- They are the smallest units of matter,.
Explanation:
Atoms are the smallest unit of which a matter composed of. Protons, neutrons, and electrons are present in an atom. Protons and neutrons together make the nucleus of the atom.
Protons are positively charged particles and neutrons are neutral therefore nucleus is having a positive charge due to the protons present in it. Electrons are negatively charged particles that revolve around the nucleus.
The electromagnetic force is generated between the negative charge of electrons and the positive charge of the nucleus which helps the atom to stay together in the matter.
Therefore, the correct answer is atoms are the smallest units of matter.
Maria walks her dog through a field full of wildflowers. When she gets back home, and begins to brush her dog, she notices seeds of many of the plants sticking to her dog’s fur. She gently removes the seeds, and tosses them out into the yard. Which will most likely cause the greatest number of seeds to germinate and grow in her backyard?
A. an unfavorable biotic factor
B. competition with another kind of organism.
C. a mutualistic relationship with another organism.
D. environmental conditions that are outside the plant’s range of tolerance.
Answer:
C. a mutualistic relationship with another organism.
Answer:
C. a mutualistic relationship with another organism.
Explanation:
A biotic factor is the living component of the ecosystem. An unfavourable biotic factor for seeds can be birds which will consume them and hence hinder their growth. Even when the seeds start to germinate competition with other species for resources like water and nutrients in soil will again slow down the growth process. Environmental conditions like temperature and pH also need to be in tolerance range of the plant otherwise it will face difficulty in growing. Hence from the given options, a mutualistic relationship with another organism will cause the seeds to germinate. For example the plant can form mutualistic relationship with nitrogen fixing bacteria which will help the plant to obtain nitrogen for growth.
Which series correctly lists the eight taxonomic levels in order, from the broadest group to the most specific group?
species, genus, family, order, class, phylum, kingdom, domain
domain, kingdom, phylum, class, order, family, genus, species
species, genus, family, class, order, phylum, kingdom, domain
domain, kingdom phylum, order, class, family, genus, species
Answer:
B. domain, kingdom, phylum, class, order, family, genus, species
Explanation:
Answer:
Yes, the answer is B
Explanation:
I had this on a bio test and got this question correct
What is the difference between human cells and plants cells?
Answer: Plant cells are surrounded by a cell wall while human cells lack. Also human cells do not contain chloroplasts. Plants are capable of making their own food, while humans can't.
Explanation:
WHICH OF THE FOLLOWING CONTAINS A CARBOXYL AND AN AMINO GROUP?
Answer:
Explanation:
1.d
2.d
3.b
It contains both an amino functional group and a carboxyl functional group. In a solution, the amino group can decrease acidity, while the carboxyl group can increase acidity.
What is carboxyl functional group?The carboxyl functional group is acidic while the amine group is basic.In an amino acid, there are two functional groups;
The amine groupThe carboxyl groupThe carboxyl functional group is acidic because it contains a replaceable or ionizable hydrogen ion. The amine group on the other hand is capable of accepting a proton hence it is basic. Therefore, In a solution, the amine group can decrease acidity, while the carboxyl group can increase acidity. Groups which are identical in all amino acids are the amino and the carboxyl groups.
Therefore, It contains both an amino functional group and a carboxyl functional group. In a solution, the amino group can decrease acidity, while the carboxyl group can increase acidity.
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Typically, nitrogen atoms are composed of seven electrons, seven protons, and seven
neutrons. An isotope of nitrogen could
a. be negatively charged.
b. have more than seven electrons and more than seven protons.
c. have more than seven protons.
d. have more than seven neutrons.
Answer:
d. have more than seven neutrons.
As the nitrogen have seven electrons, seven protons, and seven neutrons. An isotope of nitrogen could have more than seven neutrons. The correct option is d.
What is an isotope?Isotopes are sort of an element family that have the similar number of protons but varying in the number of neutrons.
The atomic number of an element on the Periodic Table is shown by the number of protons in its nucleus. Carbon, for instance, has six protons and is atomic number 6.
Isotopes can form either spontaneously (innately) through radioactive decay of a nucleus emission of energy in the form of alpha particles, beta particles, neutrons, and photons.
It can either by artificially via accelerators or neutrons in a nuclear reactor by bombarding a stable nucleus with charged particles via accelerators or neutrons.
Nitrogen comprised of seven electrons, seven protons, and seven neutrons. A nitrogen isotope will have more than seven neutrons.
Thus, the correct option is d.
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