Biology

3. a system of interlocking and interdependent food chains
7. an animal or person that eats food of both plant and animal origin
8. an animal which feeds on dead organic material, especially plant detritus
12. an animal that feeds on flesh
13. a biological community of interacting organisms and their physical environment

1. a hierarchical series of organisms each dependent on the next as a source of food
2. Any of the sequential stages in a food chain, occupied by producers at the bottom and in turn by primary, secondary, and tertiary consumers
4. physical rather than biological; not derived from living organisms
5. relating to or resulting from living things, especially in their ecological relations
6. an animal that feeds on plants
9. an organism that produces organic compounds from simple substances such as water and carbon dioxide; an autotroph
10. the state of being diverse; variety
11. an organism that derives the organic compounds and energy it needs from the consumption of other organisms; a heterotroph