1. You have 5 minutes to write your answer down in your notebook.
Bell Ringer
You have 5 minutes to write your answer down in your notebook.
Where does energy for life processes come from?

2. 3.2 Notes
Energy Flow

3. Source: Sunlight is the main energy source for life on earth
Other sources:
- energy stored in inorganic chemical compounds

4. Energy from the Sun Photosynthesis
Autotrophs use light energy to power chemical reactions
Convert carbon dioxide and water into oxygen and carbohydrates (sugars & starches)

5. Photosynthesis adds oxygen, removes carbon dioxide

6. Autotrophs vs Heterotrophs:
Can produce own food (producers)
Capture energy from sunlight or chemicals to produce food
Example: Plants, some algae
Heterotrophs-
Cannot produce own food (consumers)
Get energy and food supply from other organisms
Example: Animals, fungi
Herbivores, carnivores, omnivores, detritivores, decomposers

7. Energy Flow Flows through an ecosystem in one direction Food Chain
Sun --> autotrophs --> to various heterotrophs
Food Chain
series of steps in which organisms transfer energy by eating and being eaten

9. 3.2 Review
Fill out Heterotrophs table

10. Heterotrophs (consumers)
Herbivores
Eat plants
Deer, cows
Carnivores
Eat meat
Wolves, dogs
Omnivores
Both plants and animals
Humans, bears
Detritivores
Plant & animal dead remains
Mites, earthworms
Decomposers
Breaks down organic matter
Bacteria, fungi