Eastern and Western meadowlarks look almost the same and inhabit the same areas of prairie. They recognise mates of their own species by distinctive courtship songs. This is an example of prezygotic isolation by

Very similar species of fish release their eggs and sperms into the same water but the spermof one species cannot penetrate the eggs of another spicies. This is an example of prezygotic isolation by

Two species of garter snakes occure In the same geographic areas, but one lives only in water and the other manly on land. Consequently they do not encounter one another and so, do not interbreed. This is an example of prezygotic isolation caused by