Which of the following primary succession events led to the formation of the tundra?

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The tundra was formed as a result of the retreat of glaciers, which left behind barren land that eventually became colonized by vegetation such as grasses, shrubs, and lichens. This process is an example of primary succession, in which an ecosystem develops from scratch on bare ground, as opposed to secondary succession, which occurs after a disturbance has already taken place.

Which of the Following Primary Succession Events Led to the Formation