| A | B |
|---|
| energy | the ability to do work or cause change |
| thermodynamics | study of the flow and transformation of energy in the universe |
| first law of thermodynamics | energy is neither created nor destroyed, but may be converted from one form to another |
| second law of thermodynamics | when energy is changed from one form to another, some useful energy is always degraded into lower quality energy, usually heat |
| autotrophs | organisms that use energy from sunlight or inorganic substances to make organic compounds |
| heterotrophs | Organisms that depend on other organisms for their food |
| metabolism | the total of the chemical processes in a cell |
| photosynthesis | the anabolic process by which plants and some other organisms use light energy to convert water and carbon dioxide into oxygen and high-energy carbohydrates such as sugars and starches |
| cellular respiration | the catabolic process whereby certain organisms obtain energy by breaking down organic molecules |
| adenosine triphosphate (ATP) | One of the principal chemical compounds that living things use to store and release energy |
