A) sponges
B) threadworms
C) tapeworm
D) liver fluke
Correct Answer: A
Solution :
Sponges are the simplest multicellular animals. They have no organ systems like respiratory, excretory and circulatory, and are characterized by numerous canals and chambers that open outside by pores. The inner cavity of the sponge is lined with a layer of flagellated cells called choanocytes. These choanocyies serve various functions for sponge.
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