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The theory that living species were descend with changes from other species over time is referred to as evolution.
Living things are categorized by species
when there are no living members of a species the species is said to be "extinct".
The relationship between the terms species and organism isthat they are both living. Organisms are in a species.
Descent with modification
Descent with modification
Descent with modification
modification
Natural selection
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The theory that living species were descend with changes from other species over time is referred to as evolution.
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They can't. Once a species becomes extinct, it has reached the end of the line. It no longer exists, so therefore produces no more offspring. Thus, the theory that living species of today are descended from extinct species from long ago is untenable.
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I believe that it is the principle of evolution.
The closest living species related to the cheetah are the cougar and the jaguarundi. All are descended from a common ancestor in North America.