Animal Life Processes

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