| A | B |
|---|
| biology | the study of life |
| cell | highly organized, tiny structures |
| reproduction | process by which organisms make more of their kind |
| ecology | branch of biology that studies interactions of organisms |
| gene | the basic unit of heredity |
| heredity | the passing of traits from parent to offspring |
| evolution | change in inherited characteristics of species over generations |
| metabolism | the sum of all of the chemical reactions carried out in an organism |
