| A | B |
|---|
| water cycle | movement of water between living systems and the environment |
| carbon cycle | movement of carbon between living systems and the environment |
| nitrogen cycle | movement of nitrogen between living systems and the environment |
| photosynthesis | capturing the sun's light and changing it to food energy |
| respiration | releasing the energy stored in food |
| ATP | energy carrier molecule |
| aerobic respiration | lots of energy is released in the presence of oxygen |
| anaerobic respiration | very little energy is released in the absence of oxygen (fermentation) |
| carbon dioxide, light and water | starting molecules in photosynthesis |
| carbon dioxide | waste product of respiration |
| energy released | result of respiration |
| oxygen | "waste" product of photosynthesis |
| food and oxygen | starting molecules of respiration |
| chemosynthesis | production of food from inorganic compounds (not light!) |
