Karayh1aleile9angton Karayh1aleile9angton

08-03-2017
Biology

contestada

In which supereon did single-celled organisms first form on Earth?
a. Cambrian
b. Paleozoic
c. Phanerozoic
d. Precambrian

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blairt1 blairt1

08-03-2017

The answer is D. Precambrian.

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AceSolo AceSolo

08-03-2017

Precambrian Should be the answer

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