Which one of the following statements about all the four of Spongilla, leech, dophin and penguin is correct ?

Options

A. penguin is homoothermic, while the remaining three are poikilothermic
B. Leech is a fresh water form, while all other are marine
C. Spongilla has special collar cells called choanocytes, which ar not found in the remaining three
D. all are bilaterally symmetrical animals

Answer

C

Explanation

Spongilla has special collar cells called choanocytes, which are not found in the remaining three.