Q. Assertion Reproductive isolation brings about sympatric speciation.
Reason It is the primary mode of speciation. e.g., Darwin's finches.

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Solution:

Sympatric speciation occurs when a subpopulation that occupies the same niche develops a unique mutation that prevents it from mating with original population. Geographical or allopatric speciation that develops when population is geographically isolated. It has been considered as a primary mode of speciation, e.g., Darwin's finches.