Bees may pick up pollen of one species on a certain place on their bodies;if this area does not come into contact with the receptive structures of the flowers of another plant species,the pollen is not transferred.This is an example of:

Question

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This is an example of mechanical isolation, which occurs when the reproductive structures of different species are not compatible enough to allow for successful fertilization. In this case, the bees are physically unable to transfer the pollen from one plant species to another.

Bees May Pick Up Pollen of One Species on a Certain