Lithosphere

5. animals that only eat meat
7. An autotrophic organism that serves as a source of food for other organisms in a food chain
10. organisms that can form nutritional organic substances from simple inorganic substances
14. a process where green plants use sunlight to synthesize foods with carbon dioxide and water. Oxygen being a byproduct
15. interacting group of various species in a common location
18. the branch of biology that deals with the relations of organisms to one another and to their physical surroundings
19. an organism deriving its nutritional requirements from complex organic substances
20. a group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding
21. the region that is occupied by living organisms

1. Level each of several hierarchical levels in an ecosystem
2. a major ecological community type
3. Chain a hierarchical series of organisms each dependent on the next as a source of food
4. an organism that decomposes organic material
6. Bloom rapid increase or accumulation in the population of algae in a water system
7. groups of individuals belonging to the same species that live in the same region at the same time
8. the total mass of organisms in a given area or volume
9. a substance that provides nourishment essential for growth and the maintenance of life
11. animals that eat both meat and green foods
12. animals that only eat green foods
13. synthesis of carbohydrate from carbon dioxide and water; limited to certain bacteria and fungi
16. Web a system of interlocking and interdependent food chains
17. a biological community of interacting organisms and their physical environment