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Q.
Select the taxon mentioned that represents both marine and fresh water species.
AIPMTAIPMT 2014Animal Kingdom
Solution:
Cnidarians are the sac-like animals which are aquatic, mostly marine except a few like Hydra, are fresh water. They are the simplest organisms that have attained a tissue level of organization. Members of Ctenophora, Cephalochordata and Echinodermata are exclusively marine.