Climate change is a threat to polar bears and other species that thrive on sea ice. Melting sea ice and changing precipitation patterns impact the bears’ ability to hunt and survive. In the past few decades, the number of polar bears in the Arctic region has dropped considerably. How might humans help to save these species?

Answer:

DNA mutation causes a change in the amino acid sequence for hemoglobin, which causes a change in the shape

Explanation:

Sickle cell mutation is a mutation that affect the production of red blood cell that is needed for the transport of oxygen in the bloods stream.

sickle cell mutation is a result of change in the amino acid which are building blocks of the protein hemoglobin.

The protein is what gives red cells their color, it has two subunits. The alpha

and beta subunit. There is a change in the arrangements of amino acid sequence and that is the basis for the sickle cell shape, beta subunit has valine an amino acid at position 6 instead of the glutamic acid. This alteration results in sickle cell problems that occur in people.

Answer:

Explanation:

From the options:

The DNA mutation increases the number of amino acids in hemoglobin, which causes a change in the shape of red blood cells.

The DNA mutation causes a change in the amino acid sequence for hemoglobin, which causes a change in the shape of red blood cells.

The DNA mutation decreases the number of amino acids in hemoglobin, which causes a change in the shape of red blood cells.

O The DNA mutation prevents formation of hemoglobin, the absence of wirich causes a change in the shape of red blood cells.

The correct answer would be that "The DNA mutation causes a change in the amino acid sequence for hemoglobin, which causes a change in the shape of red blood cells. "

The sickle-cell anemia is caused by a change in the amino acid sequence of the hemoglobin - specifically, as a result of the substitution of the sixth amino acid, glutamic acid, by valine in the beta subunit of the proteins that make up the hemoglobin. A single base substitution causes glutamic acid to be changed to valine.

The normal hemoglobin is disc-shaped and is able to effectively carry oxygen in the blood, unlike the sickle-cell hemoglobin which has the sickle shape and is not able to effectively carry oxygen in the blood.

Answer: volcanic eruption and solar variation

Explanation: Hope that helped you out!

Answer:

Podemos suponer que este estudiante tiene insuficiencia de la hormona de crecimiento (somatotropina) que la secreta la glándula hipófisis y se encuentra en la base del cerebro. Esta hormona no ingresa a las células en su mecanismo de acción por ser peptídica o no esteroidea.

Explanation:

En este caso presentado se encuentra una situación diferente a lo que sucede en el gigantismo: hay un problema hormonal en donde la hormona de crecimiento es secretada de manera excesiva. Recibe el nombre de acromegalia cuando sucede después del cierre de la epífisis del hueso, luego de la edad de crecimiento.

Answer:

C. The population moves onto a large, raised, flat area called a plateau for protection from predator.

Explanation:

The plateau phase of population growth indicates that the population has stopped growing as the environment has reached its carrying capacity.

The population after going through different phases eventually reaches the plateau phase where the growth of the population stops or become constant. This is the outcome of the natality rate becoming equivalent to the mortality rate.

This occurs as the resources in the environment become less or scarce as well as there is an elevation in predators and parasites. These are considered as limiting factors to the growth of population. This makes the population number relatively stable. With the limitation in the resources it can be said that the environment has attained its carrying capacity.

Thus, the correct statement is option D.

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Answer:

Unsaturated fat, a fatty acid in which the hydrocarbon molecules have two carbons that share double or triple bond(s) and are therefore not completely saturated with hydrogen atoms. Due to the decreased saturation with hydrogen bonds, the structures are weaker and are, therefore, typically liquid (oil) at room temperature .

The role of Langerhans cells is that they prevent pathogens from entering the body using antibacterial agents.

Langerhans cell is a dendritic cell of the skin and mucosa, containing Birbeck granules, and present in all layers of the epidermis but most prominent in the stratum spinosum.

Langerhans cells play important roles in the immune system by acting as the outermost guard of the cutaneous immune system where they induce the first reactions against pathogens encountered via the skin.

Therefore, the role of Langerhans cells is that they prevent pathogens from entering the body using antibacterial agents.

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Answer: 3.identify pathogens that enter the body and carry them to lymph nodes for destruction

Explanation:

Answer:

The fluoride is what helps you avoid cavities

Explanation:

water fluoridation as safe and effective in preventing tooth decay for both children and adults

Answer: photosynthesis breaks down glucose. Hope you understand

Explanation:

Photosynthesis is related to Cellular (aerobic) Respiration in that they are equal but opposite reactions and the correct option is option B.

Photosynthesis and cellular respiration are complementary processes that are crucial for the energy flow in ecosystems. In photosynthesis, plants and some bacteria use sunlight to convert carbon dioxide and water into glucose and oxygen. This process stores energy in the form of glucose.

In cellular respiration, organisms, including plants and animals, break down glucose and other organic molecules in the presence of oxygen to release energy for cellular activities. This process consumes glucose and oxygen and produces carbon dioxide and water as byproducts.

Photosynthesis and cellular respiration are interconnected through the exchange of products and reactants. The oxygen produced in photosynthesis is used in cellular respiration, while the carbon dioxide produced in cellular respiration is used in photosynthesis. As a result, they form a continuous cycle that maintains the balance of oxygen and carbon dioxide in the atmosphere and provides energy for living organisms.

Thus, the ideal selection is option B.

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Answer:

preexisting cells present in the air can grow in sterilized nutrient broth

Explanation:

Spontaneous generation, which is the theory that life can arise from nonliving matter, has long been believed to be the way living organisms develop. However, in 1858, a French scientist called Louis Pasteur disproved the theory of spontaneous generation.

Louis Pasteur conducted an experiment to show that it is the existing microorganisms in air that causes life to grow and not the air itself. Pasteur made use of a swan-necked flask, which contained a sterilized (by boiling) broth. The swan-necked flask was designed in such a way that it would allow air to enter but trap any airborne microorganism, preventing them from reaching the broth.

Hence, if it were truly air and not existing life organisms that caused life growth, organisms should begin to grow from the broth. He conducted another experiment where be broke the neck of the flask to allow the entry of microorganisms into the sterilized broth and found out that growth of microorganisms occured on the broth.

Therefore, Pasteur, via his experiment was able to prove that preexisting cells present in the air can grow in sterilized nutrient broth if allowed entry but when there is no entry, there would be no life growth. This experiment disproved the theory of spontaneous generation.

Answer:

primary waves

Hope this helps :)

Answer:

Answer:

Food and plants!

The purpose of the Synthesis (S) phase of the cell cycle is the duplication of DNA. The correct option is D.

A cell cycle is a process of dividing a cell into two cells. It is a four-stage process that includes increasing the cell, diving the DNA, and the ready for cell dividing and then dividing into two cells.

The S phase is the synthetic phase. The phase includes duplication of DNA and dividing of DNA. During cell division or DNA replication, this process occurs.

So, all other statements are false, in the S phase, the DNA duplicates in the nucleus and the cell will ready to duplicate for cell division and mitosis. It is one of the processes of cell division or DNA replication.

Thus, the correct option is D. Duplication of DNA.

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Answer:

B. 1/2 and 1/4

Explanation:

Hemophilia is a rare disease that has to do with the inability for blood to clot. It is inherited on the X chromosome, hence, it is said to be X-linked. It is usually passed from mother to son. According to this question;

X - unaffected X chromosome

x = X chromosome affected by hemophilia

Y = Y chromosome

Therefore, in a cross between a Xx female (carrier) and a XY male (unaffected), the following chromosomes will be present in the gametes produced by each parent:

Xx- X and x gametes

XY- X and Y gametes

Using these gametes in a punnet square (see attached image), offsprings with genotypes: XX, Xx, XY and xY will be possibly produced.

XX (1) - unaffected female

Xx (1) - unaffected but carrier female

XY (1) - unaffected male

xY (1) - affected male (have hemophilia)

Based on the questions;

- 2 out of the possible 4 children will have the affected chromosomes i.e. both xY son and Xx daughter have the affected (x) chromosome. Hence, the fraction is 1/2

- 1 out of the 4 possible children is affected by hemophilia, which is the xY son. Hence, the fraction is 1/4.

Answer:

Carbon dioxide

sunlight

oxygen

chlorophyll

water

Hope this helps u

Answer: Movement.

Explanation: Cilia work the same way as flagella. They enable the cells to move because of their shape (tiny little hairs).

Answer:

'Motile' (or moving) cilia are found in the lungs, respiratory tract and middle ear. These cilia have a rhythmic waving or beating motion. They work, for instance, to keep the airways clear of mucus and dirt, allowing us to breathe easily and without irritation. They also help propel sperm.

Explanation:

Answer: there are no specimens on the slide

Answer:

some of the ways are...

Explanation:

Answer:

Hypothalamic-Pituitary-Gonadal Axis

GnRH produced by the hypothalamus stimulates the production of both LH and FSH. FSH functions by stimulating ovarian follicular development in females and regulating spermatogenesis in males. LH induces ovulation and corpus luteum formation in the ovaries.

plz give brainlist

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Answer:

The type of erosion described in the question is called Water Erosion.

Explanation:

Note that the erosion is caused by winter and spring rains.

Water Erosion can happen when raindrops disintegrate the aggregates of the topsoil. The fragments collect into the soil pores and create a coagulating action which makes it difficult for the water to penetrate the soil. The rainwater having increasingly accumulated on the surface flows off along with the topsoil.

This type of erosion can be further aggravated if:

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The type of resources each product is prinicipally derived from​:

A. Renewable resources

1. Wood

2. Ice

B. Non Renewable resources

1. Gold

2. Natural gas

Renewable energy sources come from natural components such as wind, water, the sun and even plant .

Whereas the Nonrenewable energy sources, are only present in limited quantities.

Thus, these are the answer.

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Answer:

renewable - Ice, Wood
nonrenewable - Gold, Natural Gas

Explanation:

Answer:

the scientist is studying an ecosystem

Answer:

D

Explanation:

Answer:

Phototsynthesis takes water, sunlight, and CO2 and turns it into O2. Cellular Respiration take nutirents and O2 to create ATP.

Answer:

streamlined bodies in dolphins and ichthyosaurs

Hope this helps! （づ￣3￣）づ╭❤～

Answer:

The consequences of the fall was man and woman will die man turned to mortal and will turn back into dust. woman would bring children in pain. relationships between husband and wife would be difficult. The ground was cursed labor would be very hard. human was banned from the paradise and the garden. no longer would they enjoy the holiness and justice they had in paradise.

Explanation:

Answer: b

Explanation:

Just trust

Answer:

B, ribosomes :)))))

Explanation:

The correct order of organization in animals is Cell, tissue, organ, organ system, organism—that is what is written in the option D. The cell is the first to form, followed by tissue, and finally organs and organ systems.

At the early stage, unicellular individuals were seen, and later, due to development, multicellular individuals were developed. The unicellular organism has only cells, then those cells unite to make a tissue, and in a tissue all the cells have the same function. An example is epithelial tissue, which is made up of many epithelial cells.

Tissues combine to form an organ, and organs combine to form an organ system. An example is an organ such as the liver that is made up of many tissues, but all tissues perform certain functions that are required for the liver, and in the same way, the organ system and the organism are developed.

Hence, the correct order of organization in animals is cell, tissue, organ, organ system, organism—that is what is written in the option D.

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Answer:

conformational change in troponin

Explanation:

The troponin complex plays an essential role in the thin filament regulation of striated muscle contraction.

Answer:

The best explanation for this difference is that the humus contained micronutrients needed by the plants for the synthesis of chlorophyll, such as Manganese (Mn), Iron (Fe) and Copper (Cu).

Explanation:

Chlorosis is the yellowing of plant leaves, and this is due to the deficiency in the amount of chlorophyll contained in the plant leaves. Iron (Fe) is an essential micronutrient for the synthesis of chlorophyll, which is an enzyme-catalyzed reaction. Copper (Cu) is a component of most enzymes, while Manganese (Mn) is a cofactor, required for the activation of the enzymes that catalyze chlorophyll synthesis, hence deficiency of these nutrients will result in the development of chlorosis.

Answer:

To activate the process of germination.

Explanation: