Excretory organs of arthropods are

$A$: In Paramecium,the contractile vacuole performs excretion.
$R$: In Planaria,flame cells are present which perform excretion.

Match the excretory organs listed under column $I$ with the animals given under column $II$. Choose the answer which gives the correct combination of alphabets of the two columns.

Column $I$ (Excretory organs)	Column $II$ (Animals)
$A$. Nephridia	$p$. Hydra
$B$. Malpighian tubules	$q$. Leech
$C$. Protonephridia	$r$. Shark
$D$. Kidneys	$s$. Round worms,$t$. Cockroach

Which are the excretory organs in crustacean animals?

In terms of function,what is analogous to the nephridia in earthworms?

Which of the following is an invertebrate that excretes through kidneys?