Question

multiple choice question
the not uncommon occurrence of ______ in natural settings weakens the biological species concept.

natural selection
adaptation
mutation
hybridization

Explanation:

The biological species concept defines species as groups of inter - breeding natural populations that are reproductively isolated from other such groups. Hybridization, the interbreeding between different species, challenges this concept as it blurs the lines of reproductive isolation. Natural selection is about survival and reproduction of the fittest, adaptation is the process of organisms becoming better suited to their environment, and mutation is a change in DNA sequence. None of these directly weaken the biological species concept like hybridization does.

Answer:

D. hybridization