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Biology - Extinction

Extinction

A population of a species may lose genetic diversity to the extent that
there is little or no genetic variation or potential for 'favourable'
characteristics to be selected for in times of environmental change. The
population is likely to become extinct in that area. Extinction is a
natural process in the life cycle of species (background extinction).

Extinction of species provides evolutionary opportunities. As niches
become vacant other species can evolve to occupy those niches.

The geological time scale and historical periods of mass extinction.
When you see the time line wait for the question marks to appear then
explore with your mouse.

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