Question

Hydra and how many types of hydra

Answer 1

Answer:

While all Hydra species are efficient predators, studies have found that some of the species are very selective with regards to their prey.

Explanation:

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Answer 2

Answer:

Hydroid, any member of the invertebrate class Hydrozoa (phylum Cnidaria). Most hydroids inhabit marine environments, but some have invaded freshwater habitats.

Explanation:

There are between 20-30 different species of Hydra. Hydras are one of the 9,000 species belonging to the phylum 'Cnidaria' which are simple, radially symmetrical invertebrates with tentacles