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Scientists believe that the Earth's early atmosphere lacked __________ gas because photosynthetic organisms did not yet exist. A) hydrogen B) nitrogen C) oxygen D) sulfur
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Scientists believe that the Earth's early atmosphere lacked __________ gas because photosynthetic organisms did not yet exist.

A) hydrogen
B) nitrogen
C) oxygen
D) sulfur

User Simon I
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2 Answers

3 votes

The correct answer is oxygen

User Navin Viswanath
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7.9k points
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 c)oxygen is the correct answer i am very sure.
User Alex McKenzie
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