Metanephros are present in

$Assertion (S)$: In $Paramecium$,the contractile vacuole performs excretion.
$Reason (R)$: In $Planaria$,flame cells are present,which perform excretion.

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

Green glands found in some arthropods take part in

The correct sequence of excretory organs in cockroach, earthworm, and rabbit, respectively, is:

Excretory organ found in earthworm and other annelids is