Logistic population growth
(a) Yeast grown in ideal conditions in a test tube show a classical S-shaped logistic growth curve, whereas (b) a natural population of seals shows real-world fluctuation.
Source
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"OpenStax College, Environmental Limits to Population Growth. October 17, 2013."
http://cnx.org/content/m44872/latest/Figure_45_03_02.png
OpenStax CNX
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