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'''Biology''' is the [[science | scientific]] study of [[life]].<ref name = "urry2017a">{{cite book | last1 = Urry | first1 = Lisa | last2 = Cain | first2 = Michael | last3 = Wasserman | first3 = Steven | last4 = Minorsky | first4 = Peter | last5 = Reece | first5 = Jane | chapter = Evolution, the themes of biology, and scientific inquiry | title = Campbell Biology | publisher = Pearson | edition = 11th | date = 2017 | location = New York | pages = 2–26 | isbn = 978-0134093413}}</ref><ref name = "hillis2020">{{cite book | last1 = Hillis | first1 = David M. | last2 = Heller | first2 = H. Craig | last3 = Hacker | first3 = Sally D. | last4 = Laskowski | first4 = Marta J. | last5 = Sadava | first5 = David E. | chapter = Studying life | title = Life: The Science of Biology | publisher = W. H. Freeman | edition = 12th | date = 2020 | isbn = 978-1319017644}}</ref><ref name = "freeman2017a">{{cite book | last1 = Freeman| first1 = Scott | last2 = Quillin | first2 = Kim | last3 = Allison | first3 = Lizabeth | last4 = Black | first4 = Michael | last5 = Podgorski | first5 = Greg | last6 = Taylor | first6 = Emily | last7 = Carmichael | first7 = Jeff | chapter = Biology and the three of life | title = Biological Science | publisher = Pearson | edition = 6th | date = 2017 | location = Hoboken, N.J. | pages = 1–18 | isbn = 978-0321976499}}</ref> It is a [[natural science]] with a broad scope but has several unifying themes that tie it together as a single, coherent field.<ref name = "urry2017a"/><ref name = "hillis2020"/><ref name = "freeman2017a"/> For instance, all [[living organisms]] are made up of [[Cell_(biology) | cell]]s that process hereditary information encoded in [[gene]]s, which can be transmitted to future generations. Another major theme is [[evolution]], which explains the unity and diversity of life.<ref name = "urry2017a"/><ref name = "hillis2020"/><ref name = "freeman2017a"/> Finally, all [[organism | living organism]]s require [[energy]] to move, grow, and reproduce, as well as to regulate their own internal environment.<ref name = "urry2017a"/><ref name = "hillis2020"/><ref name = "freeman2017a"/><ref name = "modell2015">{{Cite journal | last1 = Modell |first1 = Harold | last2 = Cliff | first2 = William | last3 = Michael | first3 = Joel | last4 = McFarland | first4 = Jenny | last5 = Wenderoth | first5 = Mary Pat | last6 = Wright | first6 = Ann | date = December 2015 | title = A physiologist's view of homeostasis | journal = Advances in Physiology Education | volume = 39 | issue = 4 | pages = 259–266 | doi=10.1152/advan.00107.2015 | issn = 1043-4046 | pmc = 4669363 | pmid = 26628646}}</ref><ref name = "davies2013">{{cite journal |author1=Davies, PC |author2=Rieper, E |author3=Tuszynski, JA | title=Self-organization and entropy reduction in a living cell | journal=Bio Systems | volume=111 | issue=1 | pages=1–10 | date=January 2013 | pmid=23159919 | pmc=3712629 | doi=10.1016/j.biosystems.2012.10.005 }}</ref>
[[Biologist]]s are able to study life at multiple [[Biological organisation|levels of organization]].<ref name = "urry2017a"/> From the [[molecular biology]] of a cell to the [[anatomy]] and [[physiology]] of [[plants]] and [[animals]], and evolution of [[population]]s.<ref name = "urry2017a"/><ref name=aquarenagloss>Based on definition from: {{cite web |url=http://www.bio.txstate.edu/~wetlands/Glossary/glossary.html |archive-url=https://web.archive.org/web/20040608113114/http://www.bio.txstate.edu/~wetlands/Glossary/glossary.html |archive-date=2004-06-08 |title=Aquarena Wetlands Project glossary of terms |author=<!--Staff writer(s); no by-line.--> |publisher=Texas State University at San Marcos}}</ref> Hence, there are multiple subdisciplines within biology, each defined by the nature of their [[research question]]s and the tools that they
Life on [[Earth]], which emerged
==Etymology==
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