Question

The egestion takes place in liquid form as-​

Answer 1

Answer:

There are no special organs for excretion and gaseous exchange occurs through the general body surface. Nitrogenous wastes are largely in the form of ammonia, which also diffuses through the general body surface. Hydra must remove excess fluid by contracting and expelling it through its mouth.

So, the correct answer is 'Mouth and body wall'.

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