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

Question

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

Penguin is homoiothermic 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 arebilaterally symmetrical.

All are bilaterally symmetrical.

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