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Biology 10 Online
OpenStudy (anonymous):

During what geological period do the angiosperms become more common? A. Triassic B. Permian C. Jurassic D. Cretaceous

OpenStudy (anonymous):

This occurred during the Cretaceous period, which took place almost 144 million years ago. This followed the Jurassic period and the Paleogene period of the Cenozoic era.

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