Q.

Which one of the following statements about all the four of Spongilla, Leech, Dolphin and Penguin is correct?

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a

Penguin is homeothermic while the remaining three are poikilothermic 

b

Leech is a 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 

answer is C.

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Detailed Solution

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

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Which one of the following statements about all the four of Spongilla, Leech, Dolphin and Penguin is correct?