Period mya 540 490 445 415 360 300 250 200 145 65 2.6 0.0 Paleogene Neogene Cambrian Ordovician Sikurlan Devonlan Carboniferous Permian Triassic Jurassic Cretaceous Quaternary Bar width represents numbor of living families Extinction Extinction Groups experiencing mass extinction Extinction Extinction Ordovician: 50% of animal families, including many trilobites. Extinction Cretaceous: 50% of animal families, including the last of the non-avian dinosaurs and many marine species. Dovonian: 30% of animal families, including many fishes and trilobites. Triassic: 35% of animal families-in particular, many reptiles. Permian: 60% of animal families, including many marine species, insects, amphibians, and all remaining trilobites.

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Q: water bears

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Q: How have humans influenced extinctions?

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Q: what is meant by “mass extinctions.”

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Q: When was the first mass extinction?

A:

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Paleontology

A branch of science concerning the scientific study of life from ancient times is known as paleontology. The scientists working on paleontology are known as paleontologists. Paleontologists collect the fossils of organisms from ancient times to classify them. The paleontologists also study the environment from ancient times to study the interactions between different organisms.