Answer:
Cnidaria (Coelenterate) is the class having gastrovascular
cavity. The body has a sac-like body cavity with a single... opening to the
outside for ingestion and egestion.
These are the first of multi cellular animals, which possess
tissue level organisation with a distinct division of labour. The body is made
of two layers of cells, i. e., one makes up cells on the outside of the body
and the other makes the inner lining of the body.
Some of the species live in colonies (corals), while
others have a solitary life span (Hydra).
e.g.. Hydra, Obelia, Aurelia (jellyfish), Metridium (sea anemone).
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