| A | B |
|---|
| Porifera | the phylum that sponges are classified in |
| Animal | the kingdom that sponges are classified in |
| incurrent pores | where water enters a sponge |
| central chamber | this inner area of a sponge is lined with collar cells |
| osculum | opening through which water leaves a sponge (also called the excurrent pore) |
| spicules | sharp, pointed, supporting structures which are the skeleton of a sponge; word means "little spikes" |
| base | the bottom cells of a sponge that remain attached to some stationary object all of the sponge's adult life |
| sessile | word that describes an animal that cannot move from place to place |
| flagella | the movement of these structures that are on the collar cells sets up the flow of water through a sponge's pores and out the osculum |
| collar cells | sponge structures that capture the food and digest it; they are the inner layer of cells |
| mesenchyme | loosely connected, jelly-like matrix that is between the outer layer of cells and the inner layer |
| plankton | microscopic food eaten by sponges; mostly algae, bacteria and organic debris |
| regeneration | an asexual method of reproduction whereby an organism can be cut in pieces and each piece can regrow the missing parts |
| gemmules | packets of sponge cells with protective, spicule coverings designed to survive bad conditions in a dormant state; a type of asexual reproduction |
