Question

Which part of the body is possible for the excretion amoeba and hydra?

Answer 1

Hy,
In amoeba, Pseudopodia is responsible for excretion.
In hydra, the fluid is excreted through a break in the body wall created.
Reference - Zoology book
Hope it helps
Regards
Dr Chinmay

Answer 2

Here is your answer,

The excretion of amoeba and Hydra is done by diffusion.

Hope this helps you. Have a nice day!!