The movement of water through a sponge's body?

Question

Also,

-what is the function of the ameboid cells?

-what does the sponge use as food?

-why are sponges so sensitive to pollution in the water?

thanks so much!

Answer 1

Water is pulled in through incurrent canals into the hollow center of the organism then flows out through the ostium.

-- The water coming in passes over choanocytes (the flagellated cells responsible for pulling the water in) and organic particles are filtered and digested.

I'm not sure about the rest...