A) respiratory
B) circulatory
C) excretory
D) polyfunctional
E) sensory
Correct Answer: D
Solution :
The outer layer of alimentary canal of earthworm is known as visceral peritoneum. Cells of this layer are known as chloragogen cells or chloragocytes. These cells are believed to be of multi-functioning and play a role similar to that of the liver in vertebrates.
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