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belka [17]
3 years ago
8

why do scientists believe that life first emerged from the ocean and onto land well after the ancestors of modern day cyanobacte

ria populated the earth
Biology
2 answers:
Over [174]3 years ago
8 0
These bacteria used visible light energy to create chemical energy, expelling oxygen that was converted to ozone. The ozone blocked the Sun's harmful UV radiation from reaching the ground
nata0808 [166]3 years ago
6 0

Answer:

Since the ancestors of modern day cyanobacteria added oxygen to the primitive reducing atmosphere of earth.

Explanation:

The primitive atmosphere of the earth did not have oxygen. So, life was not possible on land. The ancestors of modern-day cyanobacteria had the ability to carry out oxygenic photosynthesis which in turn releases oxygen as a by-product. Hence, these ancestors of modern-day cyanobacteria populated the land and added oxygen to the atmosphere of the earth.  

Once enough oxygen was added to support the other life forms, aquatic life forms gradually started occupying the land habitats.  

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Answer:

The animal cells produce the collagen but the plant cell does not produce collagen that responsible for producing the complex structure of protein and carbohydrates that is called extracellular matrix cell. Collagen is an important protein that provides strength to the structural integrity. On the other hand, the plant has not collagen so they have their extracellular supportive structure. The cell wall is so rigid and covered by the cell that protects it that provides shape and support to it. The plant cell also made up of molecules and these are called cellulose. These cellulose structured into the fibers that are called micro-fibrils

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3 years ago
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IRINA_888 [86]

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Explanation:

3 0
3 years ago
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schepotkina [342]
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4 0
3 years ago
20 POINTS!!!What describes the diet of a saprotroph?
Katena32 [7]

Answer:

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tamaranim1 [39]

Explanation:

In the majority of cases, the extra copy of chromosome 21 comes from the mother in the egg.

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