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

Options

A. Penguin is homoiothermic while the remaining three are poikilothermic.
B. Leech is freshwater from while all others are marine.
C. Spongilla has special collared cells called choanocytes, not found in the remaining three.
D. All are bilaterally symmetrical.

Answer

C

Explanation

Spongilla is a freshwater sponge in which the inner cellular layer of body consists of highly specialised flagellated cells called choancoytes. These cells are not found in leech, dolphin and penguin.