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Porifera (sponges, etc.)
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Assorted sponges
Sponge cells, individual
Sponge cross section showing cells
Sponge cross section showing water flow
Sponge cross sections of three major types
Sponge cut-away drawing
Sponge on rocks
Sponge showing living organism
Sponge showing water flow
Sponge spicule assortment
Sponge spicules
Venus flower basket sponge