| A | B |
|---|
| pore cells | take water and nutrients into the sponge |
| osculum | water and waste leave the songe |
| epidermis | outer layer for protection |
| spicule | support system of the sponge |
| collar cells | cells with flagella that line the inside of a sponge |
| archaeocytes | cells for digestion and excretion |
| path of digestion | pore cells, collar cells, archaeocytes |
| x | x |
