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Advocard [28]
3 years ago
13

How do most fossils form? Be sure to explain your answer.How do most fossils form? Be sure to explain your answer.

Biology
2 answers:
AleksandrR [38]3 years ago
5 0

Answer:

Explanation:

Sample Response: Most fossils are formed in water. So, for a fossil to form, an organism must die and fall to the bottom of a lake or ocean. Layers of sediment then cover the organism. Eventually, over millions of years, the layers of sediment become rock and preserve the shape of the organism.

Studentka2010 [4]3 years ago
3 0

Answer:

When a plant or animal dies in water and they are covered with mud and silt the tissues decompose leaving bones or shells. Then when sediment builds on top of the bones or shells it hardens making a fossil.

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Mature red blood cells expel their nuclei so that they have more surface area to transport oxygen and
inysia [295]

Answer:

The fact that mature red blood cells expel their nuclei, to expand their surface area and transport oxygen, can demonstrate that they cannot live very long.

Explanation:

The absence of a nucleus in mature red blood cells (erythrocytes) means that it has no genetic material and is unable to synthesize proteins to repair itself. This means a relatively short half-life for these cells.

A mature red blood cell circulates in the blood and performs its function for about 90 to 120 days, after which it is eliminated.

Regarding the other options:

<em>     B. Red blood cells can live more than 24 hours.</em>

<em>     C. The absence of a nucleus in erythrocytes does not indicate any relationship with cancer.</em>

<em>    D. Although they do not have mitochondria, erythrocytes can obtain ATP by glucose glycolysis and lactic acid fermentation. Even so, it is not related to the lack of nucleus</em>

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3 years ago
Plant shrinks when places in saltwater due to osmosis of?
aivan3 [116]
Water.

osmosis always refers to the diffusion of WATER down a concentration gradient.

diffusion can be applied to any substance;
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in the situation described, osmosis occurs by water diffusing out of the plant, down the diffusion gradient (because the salt water effectively has a lower concentration of water than in the plant) and into the salt water.
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3 years ago
10. Which criterion is not used to describe a mass movement event?
My name is Ann [436]

your answer is:

B. The angle of the slope.

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How do plants detect and regulate their responses to light?
Ymorist [56]
Receptors detect changes in the environment. For a stimulus to elicit a response, certain cells must have an appropriate receptor. Stimulation of the receptor initiates a specific signal pathway.
8 0
3 years ago
What will be the pulse rate if you meet a black bear in the forest
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Answer:

What is the heart rate of a black bear?

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2 years ago
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