Lesson 3: Invertebrates

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Across
  1. 3. An arm like body parts in invertebrates that is used for capturing prey.
  2. 5. A stage in development of some insects that lads to the adult stage
  3. 6. A small structure used by echinoderms for movement
  4. 7. Invertebrate animal that includes jellyfish, corals and hydras.
  5. 8. An invertebrate divided into three parts
  6. 10. An arrangement of body parts that looks like spokes on a wheel
  7. 14. A simple worm that is flat and thin.
  8. 15. A worm with a smooth, round body and pointed ends.
Down
  1. 1. _____ symmetry where a body plan that consists of left and right halves that are the same.
  2. 2. A class of arthropods that includes crabs, lobsters, crayfish and sow bugs.
  3. 4. The simplest animals
  4. 9. _____ worm is one whose body is divided into sections, such as earthworms or leeches.
  5. 11. A member of the largest group of invertebrate, which includes insects
  6. 12. A class of arthropods that includes spiders, scorpions, mites and ticks.
  7. 13. The process by which arthropod sheds its external skeleton