Sponges, the members of the phylum Porifera for education in marine.

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animal aquatic asymmetry background body symmetry calcium carbonate cells channels collar cell coral diving ecosystem education endoskeleton epitheliozoa heterotrophic jelly-like life marine mesohyl mineral spicules multicellular nature ocean organisms osculum ostia parahoxozoa parazoa pore pore bearer porifera reef sea sessile silicon dioxide species sperm cells spicules spoggos sponge spongin tissues transform tropical tube undersea underwater
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