I use these notes in my Marine biology class for high school seniors, but it is a semester class and the material is easily used for lower levels. These notes cover the phylum Porifera: Sponges. It covers sponge types, sponge anatomy and how sponges eat and reproduce. See the free version in 6 slides per page, which covers the entire powerpoint. If you like it, you can pay for this full version in color.