Across
- 4. how often the particles of air in a sound wave vibrate back and forth
- 5. what an animal does in response to a stimulus
- 6. a vertebrate that lives in water when its young and on land as an adult
- 9. seeds from cones grow into adult trees
- 10. a vertebrate that feeds its young with milk
- 12. vertebrates hatch from eggs and have wings
- 13. energy in a form that you can hear
- 14. how high or low a sound is
- 15. to make new organisms
- 18. a change in an objects position
- 19. an object that attracts certain metals
Down
- 1. the new organisms that form when living things reproduce
- 2. weathering of the land due to things like acid rain, or gases in the air
- 3. an objects location
- 6. an invertebrate that has jointed legs and a hard exoskeleton
- 7. an animal that has no backbone
- 8. electricity a buildup of positive or negative electric charges on an object
- 11. plant seeds from fruits/flowers grow into adult trees
- 16. a vertebrate that has a thick skin covered with dry scales
- 17. hold a plant in place suck up water through the soil