Chapter 5

6. succession that occurs on a surface where an ecosystem has previously existed
9. species that is the first organisms to colonize and newly available area
11. consumers that get their food by breaking down dead organisms
13. an organism that makes its own food
14. cycle by which carbon is cycled between the atmosphere, land, water and organisms
16. community that is final and stable
17. cycle in which nitrogen is cycled between the atmosphere, bacteria and other organisms

1. when energy from the sun enters an ecosystem when a plant uses sunlight to make sugar molecules
2. each step through which energy is transferred in a food chain
3. succession that occurs on a surface where no ecosystem existed before
4. organisms that get their energy by eating other organisms
5. cycle of the movement of phosphorous from environment to organisms and then back
7. multiple food chains linked together to show many feeding relationships
8. respiration that occurs by breaking down food to yield energy inside cells
10. bacteria that can fix atmospheric nitrogen into chemical compounds
12. succession of the gradual change and replacement of some or all species in a community
15. sequence in which energy is transferred from one organism to the next