1) Biology is the scientific study of life. It comes from the Greek words "bios" meaning life and "ology" meaning study of. 2) There are several main branches of biology including botany (the study of plants), zoology (the study of animals), and ecology (the study of interactions between organisms and their environment). 3) Science uses evidence and experimentation to build knowledge about the natural world. The goal is to understand and explain natural phenomena through observations, hypotheses, experiments, and conclusions.