A) Amoeboid cells
B) Choanocytes
C) Pigment cells
D) Gland cells
Correct Answer: B
Solution :
Choanocytes are found only in sponges. The choanocyte is an ovoid cell with free ends bearing a transparent contractile collar. The collar surrounds a single, long flagellum. Choanocytes are used in feeding and for ensuring flow of water within the animals body.
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