The excretory material other than urine eliminated from the body

In hemodialysis process, blood is taken out from the body through :

The excretory organ in cockroach

Flame cells are excretory organs in

Special excretory organs are absent in

According to the studies of evolution the excretory structures were first seen in one of the following.

Which of the following is not a nitrogenous waste?

Contractile vacuoles are the excretory organs in

The mode of excretion through contractile vacuoles

Excretory organs in mollusca