They have extremely short generation times and large populations.
They can exchange DNA with many types of prokaryotes by way of horizontal gene transfer
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Genetic variation is one of the conditions required for Natural Selection to occur.
A large population increases genetics variation. Mutation will also increase genetics variation.
The introduction of animals into a breeding population that are unrelated will increase genetic variation.
If a population dwindles, there is low genetic variation and a species may risk extinction.
Meiosis is responsible for genetic variation