If you had to define ecological succession in your own words in a 140 character text how would you define it

the process by which the structure of a biological community evolves over time. Two different types of succession-primary and secondary-have been distinguished. Primary succession occurs in essentially lifeless areas-regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. Secondary succession occurs in areas where a community that previously existed has been removed; it is typified by smaller-scale disturbances that do not eliminate all life and nutrients from the environment.