Invertebrate Diversity Chapter 23 Invertebrate Diversity

23.2 Animal Diversity Animal: multicellular, eukaryotic, heterotroph (by ingestion) whose cells lack cell walls Each animal phylum has a unique body plan. Invertebrates: no back bone Vertebrates: have back bones More than 95 percent of all animal species are invertebrates.

23.2 Animal Diversity Survival 1. Feeding: how animals eat 2. Respiration: how animals get O2 and give off CO2 3. Internal Transport: how animals move O2, nutrients, and wastes around body 4. Excretion: how animals get rid of waste

23.2 Animal Diversity 5. Response: how animals sense and respond to their environment 6. Movement: how animals move using muscles and a skeletal system 7. Reproduction: how animals keep their species alive

23.2 Animal Diversity Symmetry radial: many planes of symmetry along one axis bilateral: one plane of symmetry

Radial

Bilateral

Asymmetrical