Which statement best describes ecological succession? it is always caused by human intervention. it sometimes occurs after a disturbance. it always occurs in a predictable pattern. it is a series of rapid changes in an ecosystem.

The correct answer is it always occurs in a predictable pattern.

Ecological successsion is defined as a change in the structure of species of an ecological community over a period of time. The succession that begins in a new environment by uninfluence of pre-existing species is called primary succession. The disruption of pre-existing community because of succession is called secondary succession. Ecological succession happens in a predictable pattern. The ecological communities undergoes predictable change which creates a disturbance or initial formation of new habitat. This changes occurs in an orderly manner and can be best explained by the example of trees how they grow bigger and bigger.