The Rough Periwinkle,Littorina Saxatilis,is Found on the Coast of Northern

Multiple Choice

The rough periwinkle,Littorina saxatilis,is found on the coast of northern Spain.The snails farther up the shore are large with heavily ridged and banded shells,while those exposed to the waves farther down the shore are smaller with smooth and unbanded shells.This separation along the boundary of a habitat could lead to ____ speciation.

A) allopatric
B) prezygotic
C) parapatric
D) postzygotic
E) sympatric