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Which one of the following statements about all the four of Spongilla, Leech, Dolphin and Penguin is correct?
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- Penguin is homeothermic while the remaining three are poikilothermic
- Leech is a fresh water form while all others are marine
- Spongilla has special collared cells called choanocytes, not found in the remaining three
- All are bilaterally symmetrical
Correct Option: C
Spongilla is a fresh water sponge that belongs to phylum porifera. It has special collared cells called choanocytes. Choanocytes are not found in leech, dolphin and penguin.
