Similarity between fish and tadpole is

Radial symmetry occurs in

Which of the following features is common to both fish and tadpoles?

Statement $X$: All chordates are not vertebrates.
Reason $Y$: $Balanoglossus$ is not a vertebrate.

In which of the following phyla is metamerism (segmentation) observed?

Identify the correct terms for the following analogy-based questions:
$(i)$ Porifera : Asymmetrical :: Cnidaria : .........
$(ii)$ Annelida : Coelomate :: Platyhelminthes : ......