| A | B |
|---|
| simpliest group of invertebrates | sponges |
| sponges were once thought to be | plants |
| are covered with many pores or openings | body of a sponge |
| sponges belong to phylum | Porifera |
| Porifera means | pore-bearers |
| carries food and oxygen through the pores into the sponge | moving water |
| release waste products into the water | cells |
| have a mysterious attraction to one anther | sponge cells |
| many sponges produce | spicules |
| thin, spiny structures that form the skeleton of many sponges are | spicules |
| some sponges have skeletons of a | softer, fiberlike material |
| sponges reproduce | sexually and asexually |
| one sponge produces eggs and another one produces sperm which join and a young sponge develops | reproducing sexually |
| single organism reproduces a new organism | asexual reproduction |
| sponges reproduce asexually by | budding |
