question_answer

Which of the following statements about Spongilla, leech, dolphin and penguin is correct?

A) Penguin is homoiothermic while the remaining three are poikilothermic.

B) Leech is found in fresh water form while all others are marine.

C) Spongilla has special collared cells called choanocytes, not found in the remaining three.

D) All are bilaterally symmetrical.