Across
- 3. A period in history when hunter-gatherers learned to farm and raise animals for food
- 5. anything added to an environment that is harmful to living things
- 7. A material found in nature that is useful
- 8. study of how living things interact with the environment
- 10. a repeating pattern
- 12. organism's natural and human-made surroundings
- 14. a group of organisms that can breed with each other
- 15. What humans have made (roads, buildings, etc.)
- 16. basic unit of life
- 18. a place where an organism lives
- 19. any chemical used to kill or control pests
- 22. to produce in large quantities
- 23. ability to do work
Down
- 1. all living and non-living things in nature
- 2. another word for farming
- 4. Revolution period in history when humans started using machines to produce food and other prodcuts
- 6. a living thing
- 9. a chemical that organisms need to grow
- 11. characteristics of the land
- 13. to break apart
- 16. languages, religions, customs, art, and dress of people
- 17. person who hunts, gathers, and moves from place to place
- 20. breed and produce offspring
- 21. scientific name for modern humans