Define Biology: The word biology is derived from the greek words /bios/ meaning /life/ and /logos/ meaning /study/ and is defined as the science of life and living organisms. Biology is the science of life and it deals with the study of living organisms, including their physical structures. More specifically, it is the scientific study of living organisms and their interactions with the environment. An organism is a living entity consisting of one cell e.g. bacteria, or several cells e.g. animals, plants and fungi.