Hydra belongs to phylum:

Explanation

Hydra is a genus of small, freshwater organisms belonging to the phylum Cnidaria. Cnidaria includes a diverse group of aquatic invertebrates that also comprises jellyfish, corals, sea anemones, and hydroids.Hydra are simple, predatory animals with a tubular body and a basal disc that allows them to attach to surfaces in freshwater habitats, such as ponds, lakes, and slow-moving streams. They possess specialized stinging cells called cnidocytes, which are found in their tentacles and are used for capturing and immobilizing prey.