In which phylum is segmentation shown?

Which statement is true for $Spongilla$,$Leech$,$Dolphin$,and $Penguin$?

Match the following columns:

Column-$I$	Column-$II$
$(a)$ Gill slits open	$(i)$ Lamprey
$(b)$ Absence of paired fins	$(ii)$ Scorpion
$(c)$ Calcareous shell	$(iii)$ Wuchereria
$(d)$ Absence of flame cells	$(iv)$ Oyster
$(e)$ Ecdysis	$(v)$ Shark

Find out the incorrect match in the following options.

Identify the mismatched pair.

Read the following statements.
$(a)$ Metagenesis is observed in Helminths.
$(b)$ Echinoderms are triploblastic and coelomate animals.
$(c)$ Round worms have organ-system level of body organization.
$(d)$ Comb plates present in ctenophores help in digestion.
$(e)$ Water vascular system is characteristic of Echinoderms.
Choose the correct answer from the options given below.