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Home Q & A Board Science-Related Homework Help Physics Astronomy
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hermiz hermiz
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7 years ago
Carbon isotope evidence from rocks found on an island off the coast of Greenland, although controversial, suggests that life may have
A) existed and was well established by3.4 to 3.5 billion years ago
B) originated about 3.4 billion years ago
C) existed 3.85 billion years ago
D) originated when the Earth formed 4.6 billion years ago
Textbook 
Life in the Universe

Life in the Universe


Edition: 4th
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Life in the Universe, 4/E (Bennett, Shostak)
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DonskoyDonskoy
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7 years ago
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