Energy in Ecosystem

2. A source or supply that benefits an organism
6. A self-contained living thing
8. When an organism depends on a factor for survival
10. The level an organism occupies on a food web
11. The movement of elements or molecules through a repeated sequences of events
12. One animal eats another
14. When resources are not infinite
15. Overlapping food chains
17. Relating to water
19. Organism eats plants
20. Smallest form of matter
21. A nonliving that affects an ecosystem

1. An organism that transforms energy from the sun
3. Movement of energy from one system to another
4. A living thing in an ecosystem
5. The ability to do work
7. A group of interacting individuals of the same species located in the same area
9. A system comprising all the biotic and abiotic factors in an area and all the interactions among them
13. Consumers that eat other animals
16. Substances that provides nourishment
18. When more than one individual or population in an ecosystem relies on the same limited resources