For today's fossil fuels, humans depend on the organic remains of organisms that lived during the ________ geological period.
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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
Q25: One of the difficulties in understanding the
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Q27: The early large supercontinent called Pangaea contained
Q28: The landmass that eventually broke apart into
Q30: Cone-bearing plants are known as _.
Q31: The separation of Africa and South America
Q32: The appearance of the element _ in
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