| A | B |
|---|
| photosynthesis | Plants do this to make food |
| respiration | Animals do this to provide oxygen to every cell |
| combustion | scientific word for burning |
| pollutants | substance that is in air due to human activity |
| air quality | how free the air is from pollutants |
| atmosphere | contains the gases in the air |
| states of matter | pollutants can be any of these |
| chlorophyll | catalyst for photosynthesis |
| oxygen | used by us in respiration |
| carbon dioxide | used by plants in photosynthesis |
