| A | B |
|---|
| producer | organism that uses energy from the sun and turns it into food (chemical energy). |
| consumer | a living thing that gets its energy by eating other living things in a food chain |
| heterotroph | organism that gets its energy by eating other living things in the food chain |
| autotroph | organism that uses the sun to make food (chemical energy) |
| decomposer | organism that feeds on and breaks down dead plant or animal matter. |
| food chain | model that shows the feeding relationship between a single producer and a chain of consumers in an ecosystem. |
| food web | model used to show a feeding relationship in which many food chains overlap in an ecosystem. |
| herbivore | consumer that eats only plants |
| omnivore | consumer that eats both plants and animals |
| carnivore | consumer that eats only meat |
| trophic level | feeding level |
| first level consumers/primary consumer | level of consumers that are mainly herbivores and occasionally an omnivore |
| second level consumer/secondary consumer | level of consumer that is an omnivore |
| tertiary consumer/third level consumer | level of consumer that is mainly a carnivore |
| habitat | natural environment in which a living thing gets all that it needs to live |
| niche | role a living thing plays in its habitat |
