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. An organism is a living entity consisting of one cell e.g. bacteria, or several cells e.g. animals, plants and fungi.
Aspects of biological science range from the study of molecular mechanisms in cells, to the classification and behavior of organisms, how species evolve and interaction between ecosystems.