Trophic pyramid

3. single-celled organisms found in every ecosystem on Earth.
4. large phylum consisting of segmented worms, including terrestrial, marine, and freshwater species.
5. substance an organism needs for energy, growth, and life.
8. material that changes the color of reflected or transmitted light.
9. one-celled organisms in the kingdom protista, such as amoebas. (singular: protozoan)
12. organism that breaks down dead organic material; also sometimes referred to as detritivores
14. small insect that feeds on wood.
15. very small
18. large enough to be seen without the aid of a microscope.

1. invertebrate animal with a segmented body, exoskeleton, and jointed appendages.
2. crawling insect with between 20 and 100 segments, each with two pairs of legs.
4. diverse group of aquatic organisms, the largest of which are seaweeds.
6. community and interactions of living and nonliving things in an area.
7. Plural organisms that survive by decomposing and absorbing nutrients in organic material such as soil or dead organisms.
10. composed of living or once-living material.
11. organism on the food chain that can produce its own energy and nutrients. Also called an autotroph.
13. organism on the food chain that depends on autotrophs (producers) or other consumers for food, nutrition, and energy.
16. living or once-living thing.
17. plants' green pigment that is essential to photosynthesis.