Trilobites like Cryptolithus and Phacops dominated this geologic Era

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

Pleurodictyum belongs to this group of organisms

Brachiopods are not good index fossils because

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

Which photosynthetic organism changed the atmosphere during the PreCambrian?

The earliest insects lived during this Period of the Paleozoic

This group of organisms went extinct 65 million years ago

The group of animals dominating the most current geologic Era are

Of all the species that once roamed Earth...

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