| A | B |
|---|
| cell theory | all living things are made of cells, the cell is the basic unit of life, all cells come from pre-existing cells |
| metabolism | the sum of the chemical reactions that take place in living things |
| homeostasis | the ability to maintain a constant internal environment in response to environmental changes |
| adaptation | process by which organisms become better suited to their environment as a result of natural selection |
| reproduction | process by which organisms produce offspring |
| evolution | change in species over time |
| cell | basic unit of life |
| tissue | group of cells that work together |
| organ | group of tissues that work together |
| organ system | group of organs that work together |
| organism | a living thing |
| biosphere | the entire portion of the earth where life exists |
| species | group of organisms that are closely related and can mate to produce fertile offspring |
| biodiversity | the variety of organisms in an area |
| biology | the study of life |
| DNA | molecule that stores genetic information |
| ecosystem | community of organisms and their nonliving environment |
| abiotic | nonliving |
| biotic | living |
