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Home Q & A Board Science-Related Homework Help Physics Astronomy
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adreamer adreamer
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6 years ago
Stromatolites are
A) fossils of the first organisms to introduce oxygen into the atmosphere
B) fossils of the first multicellular organisms
C) layers of sediment that once contained colonies of ancient microbes
D) fossils of the first eukaryotes
Textbook 
Life in the Universe

Life in the Universe


Edition: 4th
Authors:
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19Clyde19Clyde
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6 years ago
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adreamer Author
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6 years ago
Awesome Slight Smile
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