Intro to Invertebrates . Chapter 25 Sections 1 & 2. Invertebrates (inverts) include all animals that lack a backbone, or vertebral column. This includes 33 Phyla. Phylum Porifera. The term Porifera means “pore-bearers” in Latin. This phylum includes Sponges.
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Sections 1 & 2
http:// backbone, or vertebral column.www.youtube.com/watch?v=by1S-kZ4gN4