One of the difficulties in understanding the evolution of life on Earth is our inability to appreciate the enormous spans of time involved.
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Q20: The first cells that evolved on Earth
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Q22: The Cambrian explosion:
A) decreased the amount of
Q23: Because of continental drift, you are likely
Q24: Similar 250-million-year-old fossils in Brazil and west
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Q27: The early large supercontinent called Pangaea contained
Q28: The landmass that eventually broke apart into
Q29: For today's fossil fuels, humans depend on
Q30: Cone-bearing plants are known as _.
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