bribri674 bribri674

22-05-2017
Biology

contestada

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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larrytrip100 larrytrip100

22-05-2017

c)oxygen is the correct answer i am very sure.

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Chelsea200 Chelsea200

24-02-2019

The correct answer is oxygen

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