1. B. E NERGY F LOW **SUNLIGHT IS THE MAIN ENERGY SOURCE FOR LIFE ON EARTH!!**  Only 1% is used by living things.

2. 1. A UTOTROPHS /P RODUCERS Make food 2. Heterotrophs/Consumers Eat other organisms

3. *S EVERAL TYPES OF HETEROTROPHS EXIST a. Herbivores Eat plants b. Carnivores Kill and eat animals c. Omnivores Eat both plants and animals d. Detrivores Consume DEAD plants and animals e. Decomposers Break down organic matter from all other organisms

4. 3. F OOD C HAINS Energy is transferred between organisms *ENERGY FLOWS IN ONE DIRECTION! 4. Food Webs Combined food chains

5. T ROPHIC LEVELS = EACH STEP IN A FOOD CHAIN OR WEB Niche: An organism’s role in its environment. (Includes food chain & food web roles as well as any symbiotic relationships) (Includes food chain & food web roles as well as any symbiotic relationships)