Energy flow

2. a person who purchases goods and services for personal use.
5. dependent on the next as a source of food
7. Person, company, or country supplying goods
8. an animal that feeds on plants.
11. an animal that feeds on flesh.
12. levels in an ecosystem, comprising organisms that share the same function in the food chain and the same nutritional relationship to the primary sources of energy.

1. Organism that forms nutritional organic substances from simple inorganic substances
3. an animal or person that eats food of both plant and animal origin
4. deriving its nutritional requirements
6. an animal which feeds on dead organic material, especially plant detritus
9. an organism, especially a soil bacterium, fungus, or invertebrate, that decomposes organic material
10. a system of food chains