Which of the following features is not a characteristic of $Protochordata$?

Which among the following has specialised tissue for conduction of water?
$(i)$ Thallophyta
$(ii)$ Bryophyta
$(iii)$ Pteridophyta
$(iv)$ Gymnosperms

In taxonomic hierarchy,family comes between

The animals having a two-chambered heart belong to the class:

Differentiate between the following:
$(a)$ Tube system of feather star and canal system of $Euplectella$
$(b)$ Skeleton of shark and sea horse
$(c)$ Respiratory organs of tadpole and frog
$(d)$ Forelimbs of birds and lizard
$(e)$ Skin of tree frog and human

Study the figure and answer the following questions:
$(a)$ Label $A$ and $B$.
$(b)$ Identify the organism and its kingdom.
$(c)$ Name two organisms (other than the one shown here) belonging to the same kingdom.