What is the function of the part labelled \[P\] in the given figure?

1.	What is the function of the part labelled \[P\] in the given figure?
A.	Nutrition
B.	Respiration
C.	Osmoregulation
D.	Both [a] and [b]
Answer» D. Both [a] and [b]

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What is the function of the part labelled \[P\] in the given figure?

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