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Adaptive radiations

are periods of evolutionary

change in which groups of organisms form many new species whose adaptions allow

them to fill different ecological roles in their communities.

Mass Extinction

The elimination of a large number of species

Speciation

The formation of a new species through the process of evolution. It is usually marked by two branching points on a tree.

Extinction

the state or process of a species, family, or larger group being or becoming extinct.

Permian

of, relating to, or denoting the last period of the Paleozoic era, between the Carboniferous and Triassic periods.

During the Permian extinction, many of the marine life and the insects

species became extinct. This was most likely due to volcanic eruptions.

K/T Boundary

The presence of iridium along the K/T indicates that the dinosaurs went extinct because of an asteroid.

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