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Porifera

Across
Made up of silica, CaCO3, or spongin for structural support
Fibrous material found in sponges
Flagellated cells that control water flow through the sponge
Most complex sponge body form
Incurrent pores
Down
Phylum of metazoans with the simplest body form that filter feed
The central cavity
Excurrent pores
Simplest sponge body form
Middle sponge body form