9. Once life began, what types of organisms lived on Earth for
the next two billion years? Where did these organisms live?
12. Propose a hypothesis to explain the differences in longevity
of snail species with planktonic and nonplanktonic
larvae.
13. Explain the consequences of plate tectonics for life on
Earth.
9. Once life began, what types of organisms lived on Earth for the next two billion years? Where did these organisms liv
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9. Once life began, what types of organisms lived on Earth for the next two billion years? Where did these organisms liv
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