chapter 23 invertebrate diversity. 23.2 animal diversity animal: multicellular, eukaryotic,...
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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
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