| A | B |
|---|
| system | complex organization formed from a simpler combination of parts |
| photosynthesis | process by which plants use the sun's energy to convert water and carbon dioxide into sugar |
| producer | organism that makes its own food (autotroph) and produces organic molecules that serve as food for other organisms in its ecosystem |
| consumer | organism that obtains food by eating producers (autotrophs) or other consumers |
| homeostasis | internal stability or "steady state" maintained by the body |
| adaptation | inherited characteristic that improves an organism's ability to survive and reproduce in a particular environment |
| population | group of individuals of the same species living in a particular area at the same time |
| natural selection | process by which individuals with inherited characteristics well-suited to the environment leave more offspring than do other individuals |
| evolution | generation to generation change in the proportion of different inherited genes in a population that account for all of the changes that have transformed life over an immense time |
