Complete the sentence. the taxon species may be defined by reproductive isolation and

a.) variation
b.) morphology
c.) dichotomy

The best and most correct answer among the choices provided by your question is the second choice or letter B. The taxon species may be defined by reproductive isolation and morphology.

In biology, a taxon (plural taxa; back-formation from taxonomy) is a group of one or more populations of an organism or organisms seen by taxonomists to form a unit.

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The answer is b, as with an inference you make a statement with no evidence