what are the types of extinction?
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There are two types of extinction: background extinction, which is a natural part of evolution, and mass extinction, which typically means some form of catastrophic event (such as a volcano eruption or an asteroid hitting the Earth) has decimated plant and animal life.
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Ordovician-silurian Extinction: 440 million years ago. Small marine organisms died out.
Devonian Extinction: 365 million years ago. ...
Permian-triassic Extinction: 250 million years ago. ...
Triassic-jurassic Extinction: 210 million years ago. ...
Cretaceous-tertiary Extinction: 65 Million Years Ago.
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