Chapter 16

1. level a step in a food chain that represents energy storage or feeding relationships.
4. an inorganic substance that an organism requires in small quantities for carrying out bodily processes, such as the transmission of nerve signals and transport of food and waste.
6. an organism that makes its own food.
9. Web a diagram that represents the transfer of food energy through a community of organisms.
10. an organic compound consisting of fats and oils.
11. an organism, such as true bacteria and fungi, that breaks down dead organisms and converts organic materials back into nutrients available to ecosystems.
12. consumers consumers that eat producers.
13. an organic compound that an organism needs in very small quantities for carrying out metabolic processes.
14. consumers eat primary consumers.
16. an organism that cannot make its own food and must obtain its energy from an external source.
18. an organism that cannot make its own food and takes it's energy from an external living source.

1. consumers predators that eat secondary consumers.
2. Acid an organic compound that stores and passes on genetic information, and uses that information to direct protein synthesis.
3. cycling the movement of essential elements and compounds through the Earth's spheres.
5. an organic compound that an organism uses as a main source of energy.
7. an organic compound that contains the element nitrogen; used by an organism's cells to build body structures and control the rates of chemical reaction in cells.
8. broom-like plates that certain whale species use to filter zooplankton and small fish out of the water.
15. wastes and other organic particles that sink in water.
17. an organism that captures energy from sunlight or chemicals and uses it to create food energy.