| A | B |
| biosphere | all organisms and the part of Earth where they exist |
| biodiversity | variety of life within an area |
| species | group of organisms so similar to one another that they can breed and produce fertile offspring |
| biology | scientific study of all forms of life |
| organism | any individual living thing |
| cell | basic unit of life |
| metabolism | all chemical processes that synthesize or break down materials within an organism |
| DNA | (stands for deoxyribonucleic acid) molecule that stores genetic information in all organisms |