Solution:
Cnidarians include both fresh water (Hydra) and marine species (Physalia). Members of Echinodermata, Ctenophora and Cephalochordata are exclusively marine.
Select the taxon mentioned that represents both marine and fresh water species.
Cnidarians include both fresh water (Hydra) and marine species (Physalia). Members of Echinodermata, Ctenophora and Cephalochordata are exclusively marine.