The Shell of a Particular Species of Snail Exhibits Anywhere

Multiple Choice

The shell of a particular species of snail exhibits anywhere from 3 to 10 coils when mature. Over a series of three years, a scientist counts the number of coils in the shells of all the mature individuals in a population of snails. Year after year, the most common phenotype is 7 coils. Snails with 3 coils or 10 coils are very rare. This is an example of _____ selection.

A) disruptive
B) stabilizing
C) directional
D) sexual