sci choice board

1234567891011121314
Across
  1. 2. symmetry: body parts are arranged in a circle around a center point
  2. 3. animal that heats its body from its environment
  3. 7. animal that generates its body heat from the inside
  4. 10. organs that exchange carbon dioxide for oxygen in water
  5. 11. an organism that lives in or on another organism, harming it
  6. 12. has a backbone
  7. 13. symmetry: can be split into left and right sides in only one way
  8. 14. changes in form as animal becomes an adult
Down
  1. 1. connects fetus to mother for nutrient and gas exchange
  2. 4. skeleton is on the inside of the body
  3. 5. shedding and replacing of an exoskeleton, skin, or feathers
  4. 6. protective membrane that surrounds the embryo
  5. 7. skeleton is on the outside of the body
  6. 8. cannot be cut into equal halves
  7. 9. does not have a backbone