Natural Science

3. organisms that break down dead animals and plant materials
6. actively hunt and kill other animals
10. something produced in addition to the main product
11. organisms that make their own food
12. a group of different populations living in a defined area
13. a way to show how energy is passed from one organism to another in the environment
15. a relationship in which both parties depend on each other for something
17. animals that eat plants
20. animals that eat both plants and animals
21. animals that feed on carrion
22. an integrated system of biotic and abiotic factors

1. a way to show how different food chains are connected in the environment
2. the angle of the ground relative to the horizontal
4. the chemical process in which plants make their own food
5. an energy level in an environment
7. organic matter in soil
8. the height above sea level
9. group of organisms of the same species that live in a defined area and are able to breed
14. animal that eats meat only
16. organisms that feed on other things
18. the study of the relationships in an ecosystem
19. the largest ecological unit on earth