The locomotory organs of $Echinodermata$ are:

What is the difference between Bryophyta and Pteridophyta?

$5$-Kingdom classification was given by:

Hair-like cilia or whip-like flagella for locomotion are present in kingdom

$(i)$ Draw a neat diagram of Hydra.
$(ii)$ Label mesoglea and gastrovascular cavity.
$(iii)$ Name the group of animals it belongs to.
$(iv)$ Name one species of this group that lives in colonies.

Why are bryophytes called the amphibians of the plant kingdom?