Final answer:
Secondary succession occurs in areas where life has already existed and soil is present. It happens after a disturbance, and pioneer species appear first before the ecosystem returns to its natural state.
Step-by-step explanation:
Secondary succession refers to the process of ecological succession that occurs in areas where life has already existed and soil is present. It occurs after a disturbance, such as a flood, fire, or the abandonment of an agriculture field. In this type of succession, pioneer species, such as grasses, appear first and gradually the ecosystem returns to its natural state. Secondary succession can occur in land-based ecosystems, but it is not limited to them. It can also occur in aquatic ecosystems, such as lakes and ponds, where a disturbance has occurred.