Question

there is no special excretory organ present in
a).birds b).amoeba c).sponges d).both a and b

Answer 1

C sponges don't have excretory organs

Answer 2

There is no special excretory organ present in the sponges.

Sponges have no nervous, excretory or circulatory system .They mostly rely on the constant flow of water through their body to obtain food and to excrete waste. They are multicellular organism whose body is made up of pores and channels which allows the water to circulate into the whole body. Sponges have unspecialized cells that can transform into other types and perform the various purposes of the body.