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  1. 5- Sponges have a relatively simple, porous body
  2. 6- Cnidarians are radial animals with tentacles and stinging cells
  3. 7- Flatworms are the simplest bilateral animals
  4. 8- Nematodes have a body cavity and a complete digestive tract
  5. 9- Diverse molluscs are variations on a common body plan
  6. 10- Annelids are segmented worms
  7. 11- Arthropods are segmented animals with jointed appendages and an exoskeleton
  8. 12- Evolution Connection: Insects are the most successful group of animals
  9. 13- Scientific Thinking: The genes that build animal bodies are ancient
  10. 14- Echinoderms have spiny skin, an endoskeleton, and a water vascular system for movement
  11. 15- Our own phylum, chordata, is distinguished by four features
  12. 16- Connection: Invertebrate diversity is a valuable but threatened resource