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Discuss why scientists know so little about Precambrian Earth
Pre-Cambrian life was mostly soft-bodied -- there were very few if any
creatures with bones, skeletons, or hard shells, so there were very few
fossils left.
Besides, it was a long, long time ago -- and geological activity on the
earth (volcanic action, subduction of continental plates, erosion, etc.)
have wiped out a lot of what was the surface of the earth then.
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