caption: (primary succession) The ecological pioneer that grows on back rock is lichen, which shares a mutualistic relationship with fungus and alga. Over time, lichen converts atmospheric nitrogen into useful forms for other organisms, break down rock and add organic material to form soil. (secondary succession) a disturbance affects the community without completely destroying it. Occurs faster because soil remains. The students can also draw a Venn-Diagram in their notes so that they are able to compare and contrast primary and secondary succession.
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