Question

Select the taxon mentioned below that represents both marine and fresh water species –

• A. Cnidaria
• B. Ctenophora
• C. Cephalochordates
• D. Echinoderms

Answer 1

The correct option is A Cnidaria

Coelenterata (Cnidaria) are aquatic, mostly marine, sessile or free-swimming, radially symmetrical animals with the handful of exception like hydra which is fresh water.
Cephalochordate is often referred to as protochordates and are exclusively marine.
Ctenophores, commonly known as sea walnuts or comb jellies are exclusively marine, radially symmetrical, diploblastic organisms with tissue level of organisation.
Echinodermata are marine with organ-system level of organisation.

So, the correct answer is- option d.