1. Invertebrate Diversity
Chapter 23
Invertebrate Diversity

2. 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.

3. 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

4. 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

5. 23.2 Animal Diversity
Symmetry
radial: many planes of symmetry along one axis
bilateral: one plane of symmetry

6. Radial

7. Bilateral

8. Asymmetrical