Sponges are made of what kind substances?Sponges belong to a phylum called porifera which comes under invertebrates animal. so i agree on them being a real living organism.

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anonymous · Answer

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trancenova · Answer

The question usually isn't whether they are a real organism, but if they are a true animal. Mainly because they are a bunch of independent though interacting cells (stick a sponge in a blender and it will still be alive!).

anonymous · Answer

http://www.ucmp.berkeley.edu/porifera/pororg.html http://www.ucmp.berkeley.edu/porifera/porskel.html