Life is a struggle for survival. Animals live under constant stress to obtain enough food to eat by being as well adapted to their environments as they can. Animals who are poorly adapted will, in times of hardship, starve, fail to reproduce, and eventually die out completely. Throughout Earth’s history, life has constantly been taking new forms which are immediately tested for survival. When the climate or environment changes drastically, many animals who are poorly adapted for their new situation become extinct. Mass extinctions are when a substantial proportion of Earth’s life has vanished completely, leaving no further fossils or descendants. These events have been occurring since nearly the first appearance of life itself. All the animals alive today are merely the descendants of creatures who have been lucky enough to have met the adaption requirements each time their world changed. Here we look at ten of the biggest extinction events in Earth’s history.
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