Explain the biological species concept and describe the mechanisms of speciation.

The biological species concept defines a species as members of populations that actually or potentially interbreed in nature, not according to similarity of appearance. Although appearance is helpful in identifying species, it does not define species. 

In order to be considered to be a single species in the biological species concept, a group of organisms must produce healthy, fertile offspring when they interbreed. In some case, organisms of different species __________ ______ ____ ___ __________ ______ ________ ______ __________ _________ ___ _________.
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