The appearance of the element ________ in the atmosphere allowed an ozone layer to develop that blocked ultraviolet rays from the sun.
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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
Q26: Scientists have succeeded in producing RNA in
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 _.
Q31: The separation of Africa and South America
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