Across
- 2. any change that causes a response
- 7. genetic differences within a population
- 11. the stimulus that causes thigmotropism
- 12. the process of advantageous traits being passed down from generation to generation is ___________ selection
- 14. hummingbirds have long ______ so that they can reach nectar inside flowers
- 15. what birds with a short very strong beak most likely eat
- 16. when humans breed organisms for a specific trait it is called _________ breeding
- 18. a defense mechanism where animals try to look like different animals
Down
- 1. the pressure inside a plant cell that helps the plant stand up straight
- 3. the stimulus that causes geotropism
- 4. plant growth in response to light
- 5. where Darwin studied animals and developed the theory of natural selection
- 6. the process that makes animals better suited to their environments
- 8. thick layer underneath skin that keeps animals warm
- 9. the underground structures where some plants store food to survive droughts
- 10. tissue in plants that transports food and nutrients
- 13. the name of the scientist who developed the theory of natural selection
- 17. tissue in plants that transports water and minerals