Biology, 20.05.2021 18:10, ashtonbillups
What evidence BEST supports the presence of atmospheric oxygen 2.7 billion years ago?
a. carbon 14 in plants
b. fossils found in stomatolites
c. layered iron rust in rocks
Answers: 3
Biology, 22.06.2019 02:30, sabrinarasull1pe6s61
Ecologist have observed a sharp increase of sulfur dioxide in the air . what might be a possible consequence of excessive sulfur dioxide in the air ? a. acid rain b. ozone layer depletion c. ozone layer hole d. increase in sea levels
Answers: 1
What evidence BEST supports the presence of atmospheric oxygen 2.7 billion years ago?
a. carbon 14...
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