Question

what starts ecological succession?
disturbances in the ecosystem
carbon sequestering in the soil
excessive fertilizer usage

Explanation:

Ecological succession is initiated by disturbances in the ecosystem like a fire, flood or human - made changes. These disturbances create opportunities for new species to colonize and establish, starting the process of succession. Carbon sequestering in the soil is related to the storage of carbon and not the start of succession. Excessive fertilizer usage can have negative impacts on an ecosystem but is not what starts ecological succession.

Answer:

disturbances in the ecosystem