sci choice board

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Across
  1. 2. does not have a backbone
  2. 5. changes in form as animal becomes an adult
  3. 7. symmetry: can be split into left and right sides in only one way
  4. 9. protective membrane that surrounds the embryo
  5. 11. an organism that lives in or on another organism, harming it
  6. 12. symmetry: body parts are arranged in a circle around a center point
  7. 13. connects fetus to mother for nutrient and gas exchange
  8. 15. animal that heats its body from its environment
Down
  1. 1. animal that generates its body heat from the inside
  2. 3. skeleton is on the outside of the body
  3. 4. shedding and replacing of an exoskeleton, skin, or feathers
  4. 6. organs that exchange carbon dioxide for oxygen in water
  5. 8. skeleton is on the inside of the body
  6. 10. has a backbone
  7. 14. cannot be cut into equal halves