Yet when they are brought together artificially, they can interbreed. Such hybrids are called tions and ligers. Do they challenge the definition of species? Not really. The key words are ...

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A species is a group of organisms that interbreed to produce fertile offspring. Selective breeding is when organisms are deliberately bred so their offspring have the desirable characteristics.

A species is a group of organisms that interbreed to produce fertile offspring. Selective breeding is when organisms are deliberately bred so their offspring have the desirable characteristics.