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Gwar [14]
2 years ago
5

What do the bubbles in ice cores represent?

Biology
1 answer:
Sveta_85 [38]2 years ago
3 0
C.

They are air bubbles and depending on when the ice froze, that is air that can be used at a sample to measure the carbon dioxide levels in the atmosphere at the time of freezing.
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Which of the following processes transfers carbon directly from sea water to sea plants
Ray Of Light [21]
I don’t see the “following” that ur talking abt but it is diffusion
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Prokaryotes are structurally simple creatures that have existed for over a billion years. Which of the following are prokaryotes
GrogVix [38]

Answer:

Bacteria

Explanation:

Jus took tha test

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How will clear-cutting of forests affect the level of carbon dioxide in the atmosphere? A. It will decrease because of decreased
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It will increase because of decreased photosynthesis. Photosynthesis uses carbon dioxide to function. So, the carbon dioxide levels would go up as the oxygen levels go down.

I hope this helps!
~cupcake
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3 years ago
Explain how the structure (order) of DNA can determine the structure of a protein. Use as many of the following terms as you can
jek_recluse [69]

The stages of DNA bases in a molecule can determine the order of amino acids in protein molecules. Groups of three bases called triplets represent different amino acids. This is the basis of the genetic code . A sequence  of bases (genetic information) on DNA that codes for a protein is called a gene

3 0
3 years ago
choose five body systems that are involved in maintaining homeostasis in your body as you answer these assessment questions. Exp
gayaneshka [121]

Answer:

Explanation:

Water Levels

For example, the cardiovascular, urinary, and lymphatic systems all help the body control water balance. The cardiovascular and lymphatic systems transport fluids throughout the body and help sense both solute and water levels and regulate pressure. If the water level gets too high, the urinary system produces more dilute urine (urine with a higher water content) to help eliminate the excess water. If the water level gets too low, more concentrated urine is produced so that water is conserved.

Internal Temperatures

Similarly, the cardiovascular, integumentary (skin and associated structures), respiratory, and muscular systems work together to help the body maintain a stable internal temperature. If body temperature rises, blood vessels in the skin dilate, allowing more blood to flow near the skin’s surface. This allows heat to dissipate through the skin and into the surrounding air. The skin may also produce sweat if the body gets too hot; when the sweat evaporates, it helps to cool the body. Rapid breathing can also help the body eliminate excess heat. Together, these responses to increased body temperature explain why you sweat, pant, and become red in the face when you exercise hard. (Heavy breathing during exercise is also one way the body gets more oxygen to your muscles, and gets rid of the extra carbon dioxide produced by the muscles.)

Conversely, if your body is too cold, blood vessels in the skin contract, and blood flow to the extremities (arms and legs) slows. Muscles contract and relax rapidly, which generates heat to keep you warm. The hair on your skin rises, trapping more air, which is a good insulator, near your skin. These responses to decreased body temperature explain why you shiver, get “goose bumps,” and have cold, pale extremities when you are cold.

Homeostasis of Ions

Body functions such as regulation of the heartbeat, contraction of muscles, activation of enzymes, and cellular communication require tightly regulated calcium levels. Normally, we get a lot of calcium from our diet. The small intestine absorbs calcium from digested food.

The endocrine system is the control center for regulating blood calcium homeostasis. The parathyroid and thyroid glands contain receptors that respond to levels of calcium in the blood. In this feedback system, blood calcium level is the variable, because it changes in response to the environment. Changes in blood calcium level have the following effects:

When blood calcium is low, the parathyroid gland secretes parathyroid hormone. This hormone causes effector organs (the kidneys and bones) to respond to increase calcium levels. The kidneys prevent calcium from being excreted in the urine. Osteoclasts in bones reabsorb bone tissue and release calcium.

When blood calcium levels are high, the thyroid gland releases calcitonin. Calcitonin causes the kidneys to reabsorb less calcium from the filtrate, allowing excess calcium to be removed from the body in urine. Calcitonin also suppresses the formation of active vitamin D in the kidneys; without vitamin D the small intestines don’t absorb as much dietary calcium. Osteoblasts, stimulated by calcitonin, use calcium in the blood to add to bone tissue.

4 0
3 years ago
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