help with sponges, cnidarians, mollusks, and echinoderms!!!

[mebcooch2]

what type of nervous system does a sponge have?

how do cnidarians carry out respiration?
and what type of circulatory sytem do they have (closed, open, diffusion, etc.)?

do mollusks have an open circulatory system?

and finally...
how do echinoderms reproduce and what type of circulatory system do they have??


thanks so much for any help you can give me!!
=]

[Dr.Stein]

You can find the answer in your Animal Physiology textbook. I am pretty sure it is there, because I am currently writing a lecture note for it, and some references, books and internet, provide a lot of info about it. You just need couple minutes to do that

[Volvox]

Please try to answer these first. I will be more than happy to tell you if your answers are correct. I just got done teaching my students a zoology unit and am writing their practical.

[nugget]

i know these answers but the pros above are right :S u should really find out , research is one of the keys to being a good scientist

[February Beetle]

It's in General Zoo textbooks, also