Contrast the physical and chemical conditions on earth


Problem:

Question 1: Compare and contrast the physical and chemical conditions on Earth at the time that life first arose with conditions today.

Question 2: From a physiological standpoint, discuss two reasons why animals could not have existed on early Earth.

Question 3: Explain how microbial metabolism altered the Earth's biosphere?

Question 4: How might life on Earth be different if cyanobacteria had not evolved? Explain

I dont need long explanation. Just few sentences of expanation.

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Biology: Contrast the physical and chemical conditions on earth
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