stephanieaccles stephanieaccles

21-09-2020
Biology

contestada

How is modern Earth different from Earth over four billion years ago?

A. Constantly bombarded with comets and asteroids.
B. Little to no oxygen.
C. High levels of ultraviolet radiation.
D. Protective atmosphere.

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Otters1125 Otters1125

21-09-2020

I believe it’s B. Oxygen depleted from the earth making many animals smaller and not as mutated.

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spoiledbrat928 spoiledbrat928

26-10-2021

Answer:

b

Explanation:

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