An animal that is initially male and then changes to female is called:

Based on the given figure showing cross-sections of animals,identify the correct classification for $a, b,$ and $c$ regarding their body cavity (coelom).

$S$ - Statement: $Amoeba$ possesses pseudopodia for locomotion.
$R$ - Reason: $Earthworm$ possesses jointed appendages for locomotion.

The given figure shows four animals $A, B, C$ and $D$. Select the correct option regarding the common features shared by any two of them.

Which of the following groups are classified as Anamniotes?

Match the following columns:

Column-$I$	Column-$II$
$(a)$ Water vascular system	$(i)$ Balanoglossus
$(b)$ Malpighian tubule	$(ii)$ Hyalonema
$(c)$ Amphiblastula	$(iii)$ Sea lily (Antedon)
$(d)$ Proboscis gland	$(iv)$ Periplaneta