Examlex
If a piece of matter has no visible boundaries then it is a pure substance.
Interbreeding Populations
Groups of the same species that are capable of reproducing together, sharing a common gene pool.
Reproductive Isolation
A collection of mechanisms, behaviors, and physiological processes that prevent the members of two different species from producing offspring, or ensure that any offspring are sterile.
Speciation
Emergence of a new species.
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