Invertebrate is a term used to describe animals that lack a vertebral column, also known as the spinal column, spine, or backbone. Most animal species in the animal kingdom are invertebrates. In part I of this series, I will briefly and generally discuss the following phyla: Phylum Porifera, Phylum Ctenophora, Phylum Placozoa, and Phylum Cnidaria. The remaining invertebrate phyla are discussed in subsequent videos.
#invertebrate #porifera #ctenophora #placozoa #cnidaria