Question

what can a drought (lack of rainfall for an extended period) or a wildfire cause to begin? primary succession secondary succession tertiary succession

Explanation:

Primary succession starts on bare, lifeless areas (e.g., after volcanic eruptions or glacial retreat). Secondary succession occurs in areas where a disturbance (like drought or wildfire) destroys existing communities but leaves soil and some organisms. Tertiary succession is not a standard ecological term. Drought or wildfire are disturbances that leave soil intact, so they trigger secondary succession.

Answer:

B. secondary succession