Refer to the figure. 
The figure shows the cross section (at right) of a sea star are.Within the arm are tube feet with two parts: an ampulla and a suction cup.The ampulla is connected to a tube.When muscles in the ampulla contract, they push water into the tube, resulting in
A) concentration of solutes in the body cavity.
B) a suction cup detaching.
C) a suction cup attaching.
D) water pressure lifting an arm.
E) expansion of the madreporite.
Correct Answer:
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