The biological species idea states that organisms can only interbreed and generate viable, fruitful offspring within their own species.
The biggest group of organisms in which any two individuals of the right sexes or mating types can conceive a fertile offspring, usually by sexual reproduction, is referred to as a species. The amino acid sequence of a protein that is found in all species will differ. After a protein has been selected, its amino acid sequence in various species is compared. A closer relationship between two species is indicated by greater similarity or fewer differences. The genetic code and DNA show how life has a common ancestor.
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