For the biology of the human body, see
human anatomy and
human physiology. For the song by
Girls Aloud see
Biology (song) Biology studies the variety of life (clockwise from top-left)
E. coli, tree
fern,
gazelle,
Goliath beetleBiology (from Greek: βίος, bio, "
life"; and λόγος, logos, "
knowledge"), also referred to as the biological sciences, is the
scientific study of
life. Biology examines the structure, function, growth, origin, evolution, and distribution of living things. It classifies and describes organisms, their functions, how species come into existence, and the interactions they have with each other and with the
natural environment. Four unifying principles form the foundation of modern biology:
cell theory,
evolution,
genetics and
homeostasis.
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