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Which of the following is correct about ...

Which of the following is correct about protonephridia/flame cells?

A

Protonephridia are the excretory structures in platyhelminthes (e.g Planaria), rotifers and some annelids

B

Protonephridia are the excretory structures in the cephalochordates e.g. Amphioxus

C

Protonephridia are primarily concerned with ionic and fluid volume regulation i.e. osmoregulation

D

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