The Crayfish Has a Cavity or ___________ Lined with Sensory

Multiple Choice

The crayfish has a cavity or ___________ lined with sensory seta or hairs.A grain in the cavity is pulled downward by gravity;the pressure against the bottom hairs of the cavity gives the crayfish a perception of being upright and when it changes orientation,the grain touches side hairs that make it realize it is not upright.Thus the crayfish "knows" which way is up in the dark.

A) ampulla
B) labyrinth
C) saccule
D) statocyst
E) statolith