Question

what does a hydra use for ingestion

Answer 1

Hydras are predatory; they eat worms, insect larvae, small crustaceans, larval fish, and other invertebrates. They use their stinging cells to stun, entangle, or kill their prey before eating it. Some species of Hydra have even been known to sting fish to death.

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Answer 2

hydra that when the stinging cells penetrate they prey, proteins set free from the prey stimulate Hydra to open its mouth and to curl the tentacles towards it. The food is put into the mouth and digestion begins. ... These enzymes begin to break down the food into smaller particles.