Trochophore larva occurs in

Which of the following organisms exhibit radial symmetry?

In the given examples,how many animals are viviparous? Corvus,Columba,Macropus,Pteropus,Calotes,Hemidactylus,Psittacula,Struthio and Macaca.

Match the following columns:

Column-$I$	Column-$II$
$(a)$ Contractile vacuole	$(i)$ Excretory unit
$(b)$ Parapodia	$(ii)$ Food ingestion
$(c)$ Flame cells	$(iii)$ Locomotion
$(d)$ Nematocysts	$(iv)$ Osmoregulation

$Peripatus$ is a connecting link between

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