A) Sponge
B) Earthworm
C) Cockroach
D) Hydra
Correct Answer: D
Solution :
The neurons of Hydra synapse with each other and other body cells. As a result, it responds to external stimuli. However, there is no brain in Hydra to co-ordinate the responses.
You need to login to perform this action.
You will be redirected in
3 sec
