Question

what is this

Coelenterata ( hollow animals)
or
Platyhelminthes ( flatworms)

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Answer 1

Answer:

Coelenterata is a term encompassing the animal phyla Cnidaria and Ctenophora. The name comes from Ancient Greek: κοῖλος, romanized: koilos, lit. 'hollow' and ἔντερον, enteron, 'intestine', referring to the hollow body cavity common to these two phyla.

Answer 2

COELENTERATA it is animal which is living in the water.