There are two species of sparrows that appear very similar to each other. a scientist tried tomate them. he observed that in spite of being of the same species, they didn’t interbreed. what evolutionary force must have worked in this example?
a. migration
b. geographical isolation
c. reproductive isolation

So the most scientist is trying to mate to birds together. This will mean that he s probably just putting them both in the same cage. Since they're not going anywhere, it can't be migration. Most likely, they're not isolated from one another by location, unless there in a crazy huge, national park size cage. By elimination. the answer would be "C.Reproductive isolation"