Question

use the drop-down menus to complete the statements. primary succession begins when a pioneer species begins to grow in a new environment. primary succession takes place even in the absence of soil. primary succession would most likely begin after a glacier moves flood happens forest fire occurs

Explanation:

Primary succession occurs in lifeless areas with no soil, like after a glacier moves (exposing bare rock with no soil). Floods and forest fires leave soil, so they trigger secondary succession. So the correct option for the third blank is "glacier moves".

Answer:

glacier moves