Diploblastic acoelomate condition is found in:

Diploblastic animals belong to the phylum

Which of the following animal phyla exhibit radial symmetry in their body organization?

This organism possesses an organized endoskeleton made of calcium carbonate.

The presence of which of the following is a characteristic feature of Cnidarians?

Which of the following statement$(s)$ is/are correct regarding phylum $Coelenterata$ (Cnidaria)?
$(A)$ They are aquatic,mostly marine,sessile or free-swimming,radially symmetrical animals.
$(B)$ They have a central gastro-vascular cavity with a single opening on hypostome.
$(C)$ Digestion is extracellular and intracellular.
$(D)$ Their members are $Sycon$,$Spongilla$ and $Euspongia$.