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In which supereon did single-celled organisms first form on Earth?

a. Cambrian
b. Paleozoic
c. Phanerozoic
d. Precambrian

User Davarisg
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2 Answers

3 votes
Precambrian Should be the answer
User MobileAgent
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2 votes
The answer is D. Precambrian.
User Almarc
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