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<div style="border: none; width:200px;"><div class="thumbcaption">Biology is the study of the many varieties of [[life]] ''(clockwise from top-left)'' ''[[E. coli]]'', [[tree fern]], [[gazelle]], [[Goliathus|Goliath beetle]]</div></div></div>
'''Biology''' (from [[Greek Language|Greek]]
Biology examines the structure, function, growth, origin, evolution, distribution and classification of all [[Life|living]] things. Five unifying principles form the foundation of modern biology: [[cell theory]], [[evolution]], [[gene|gene theory]], [[energy]], and [[homeostasis]].<ref name="avila_biology">{{cite book |author=Avila, Vernon L. |title=Biology: Investigating life on earth |publisher=Jones and Bartlett |location=Boston |year=1995 |pages=11–18|isbn=0-86720-942-9 |oclc= |doi= |accessdate=}}</ref>
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