The Main Difference Between Protonephridia and Metanephridia Is That

The main difference between protonephridia and metanephridia is that

A) protonephridia are involved in osmoregulation, whereas metanephridia are involved in excretion.
B) protonephridia consist of blind flame cells, whereas metanephridia consist of tubules open at both ends.
C) protonephridia are involved in excretion, whereas metanephridia are involved in osmoregulation.
D) protonephridia consist of tubules open at both ends, whereas metanephridia consist of blind flame cells.
E) protonephridia are found in annelids and metanephridia are found in flatworms.

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