Cellular slime mold life cycle
Cellular slime molds may engage in two forms of life cycles: as solitary amoebas when nutrients are abundant or as aggregated amoebas (inset photo) when nutrients are scarce. In aggregate form, some individuals contribute to the formation of a stalk, on top of which sits a fruiting body full of spores that disseminate and germinate in the proper moist environment.
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"OpenStax College, Groups of Protists. November 18, 2013."
http://cnx.org/content/m44617/latest/
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