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