The excretory organ of crustaceans is:

In $Amoeba$,excretion occurs through the ...

Green glands are excretory in function which are found in

Urinary bladder is absent in:

Which of the following cells are associated with excretion in animals?

Analogy type question:
$(1)$ Amphibians and marine fish : Excrete urea :: Reptiles and birds : .......... .
$(2)$ In prawns : Antennal gland :: Platyhelminthes : .......... .