The sea snail,Littorina saxatilis,is found on the coast of northern Spain.The snails further upshore are large with heavily ridged and banded shells,and share a border with the snails further downshore that are smaller with smooth,unbanded shells.If the upshore and downshore snails were to become separate species,this would be an example of _____ speciation.

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Parapatric speciation occurs when populations of a species that share a common border evolve into distinct species while still in contact along that border. This scenario fits the description of the snails living on the coast of northern Spain, where the upshore and downshore populations are differentiating while still in contact.

The Sea Snail,Littorina Saxatilis,is Found on the Coast of Northern