Organisms have the capacity to overreproduce.
Overbreeding involves breeding an animal more than its body can safely handle resulting in detrimental health effects to the mother and her puppies as well as the overpopulation and subsequent euthanasia of many unwanted animals every year.
Darwin's revolutionary theory was that new species arise naturally, by a process of evolution, rather than having been created—forever immutable—by God.
The five theories were: (1) evolution as such, (2) common descent, (3) gradualism, (4) multiplication of species, and (5) natural selection.
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