<unk>  biology (formerly cytology, from the Greek kytos, "container") is an academic discipline that studies<unk> s – their physiological properties, their structure, the organelles they contain, interactions with their environment, their life cycle, division and death. This is done both on a microscopic and molecular level.<unk>  biology research extends to both the great diversity of single-celled organisms like bacteria and the many specialized<unk> s in multicellular organisms like humans.<unk> s and the<unk>  Theory are fundamental concepts in biology.<unk> s are the structural and functional unit of all known living organisms.<unk> s are the smallest unit of an organism that is classified as living, and is sometimes called the building block of life. The word<unk>  comes from the Latin<unk> ula, meaning, a small room. The descriptive name for the smallest living biological structure was chosen by Robert Hooke in a book he published in 1665 when he compared the cork<unk> s he saw through his microscope to the small rooms monks lived in.
The following list of topics is provided as an overview of and introduction to<unk>  biology:
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