Invertebrate Vocab Crossword

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Across
  1. 7. circulatory system/a system in which blood is always pumped throughout the body
  2. 8. internal skeleton made of bone and cartilage
  3. 10. hard, external, supporting structure that develops from the ectoderm
  4. 11. digestive tract
  5. 12. circulatory system/a system in which a fluid in a cavity called the hemocoel bathes the organs directly with oxygen and nutrients
  6. 13. vascular system/the networks of blood vessels within the organism
Down
  1. 1. part of a larger structure, such as the body of an organism, that is set off by natural or arbitrary boundaries
  2. 2. phase in the life cycle of many animals during which a rapid change from the immature organism to the adult takes place; an example is the change from larva to adult in insects
  3. 3. animal that does not have a backbone
  4. 4. mass of nerve cells
  5. 5. eye composed of many light detectors separated by pigment cells
  6. 6. body cavity that contains internal organs
  7. 9. feeler that is on the head of an invertebrate, such as a crustacean or an insect, and that senses touch, taste, or smell