| A | B |
|---|
| acid rain | precipitation with below-normal pH, often the result of industrial pollution and automobile exhaust |
| biology | science of life |
| cancer | a disease characterized by abnormal cell growth |
| cell | smallest unit that can perform all the life processes |
| control | factor that is held constant thoroughout an experiment to test a hypothesis |
| cystic fibrosis | genetic disorder in which excessive amounts pf mucus are secreted, blocking intestinal and brochial ducts and causing difficulty in breathing |
| experiment | test of a hypothesis in which data are gathered under controlled conditions |
| heredity | transmission of genetic traits from parent to offspring |
| HIV | human immunodeficiency virus that causes AIDS |
| homeostasis | maint |
