| A | B |
| Cycle | a set of events that happen again and again in the same order |
| Photosynthesis | the process that plants use to turn sunlight, carbon dioxide and water into food |
| Cellular Respiration | the process plant and animal cell use to turn glucose and oxygen into energy |
| Decomposition | breaking dead plants and animals down to return them to the soil |
| Carbon Cycle | the process of moving carbon atoms around in the natural world from one place to another |
| Fossil Fuels | oil, coal, and natural gas |
| Combustion | when something is burning |
| Energy | the ability to move and do work |
| Life cycle | the stages of an organism's life, from birth through adult |
| Metamorphosis | the process that some animals go through to change form |
| Ecosystem | an area that contains living and non-living things |
| Food Web | a diagram that shows how energy moves from one organism to another through food |
| Producer | an organism that uses the sun's energy to make food |
| Consumer | an organism that must eat plants and animals to get energy |
| Herbivore | an organism that uses the sun to make food |
| Omnivore | an organism that eats plants and animals |
| Carnivore | an organism that eats only animals |
| Decomposer | an organism that eats dead organisms to break them down and return them to soil |