Primary succession takes much longer than secondary succession because it involves

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Primary succession starts with bare rock or soil with little to no organic matter. It takes time for physical and chemical weathering of the rock and the formation of soil horizons to occur, which is necessary for plant growth and colonization. This process can take hundreds or even thousands of years. In contrast, secondary succession occurs on preexisting soil and involves the recolonization of plant and animal species that were present before a disturbance.

Primary Succession Takes Much Longer Than Secondary Succession Because It