Subject :NSO Class : Class 9
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.