Across
- 1. simplest and least organized nervous system
- 2. asexual reproduction
- 4. when a muscle does this it returns to its original length
- 5. you close a window when it is raining
- 9. snakes move by contracting this
- 12. joining of an egg and sperm cell
- 13. digestive system similar to a human
- 14. egg develops into this during incomplete metamorphosis
Down
- 1. tiny vessels where blood and body cells exchange substances
- 3. process where cells use oxygen and digested food to release energy
- 6. provides support for insects
- 7. butterfly's mouthparts does this to nectar
- 8. adaptation for amphibian feet in water
- 10. sharks have this type of fertilization
- 11. science that studies plants, animals and human body