Geologic Time: Life on Earth

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Pleurodictyum belongs to this group of organisms

The earliest insects lived during this Period of the Paleozoic

This group of organisms went extinct 65 million years ago

Of all the species that once roamed Earth...

Which of the following groups of organism NEVER lived on Earth at the same time?

Which large group of organisms was abundant during the Permian Period?

Trilobites like Cryptolithus and Phacops dominated this geologic Era

Which photosynthetic organism changed the atmosphere during the PreCambrian?