bi•ol•o•gy [bahy-ol-uh-jee]
noun
1. the science of life or living matter in all its forms and phenomena, especially with reference to origin, growth, reproduction, structure, and behavior.
2. the living organisms of a region: the biology of Pennsylvania.
3. the biological  phenomena characteristic of an organism or a group of organisms: the biology of a worm.
(dictionary.com)