The definition of ''species'' include the distinction that the offspring are fertile because fertility leads to the continuation of next generation.
The Biological Species Concept defines a species is a group of organisms that can interbreed with each other and produce fertile offspring. According to this concept, a species' integrity is maintained by interbreeding within a species and by reproductive barriers between organisms in different species.
So we can conclude that the definition of ''species'' include the distinction that the offspring are fertile because fertility leads to the continuation of next generation.
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