In an ecosystem, the vertical distribution of different species occupying different levels is called.

Stratification

The correct answer is Option (2) -Stratification

Stratification refers to the vertical distribution of different species occupying different levels or layers within an ecosystem. It is commonly observed in ecosystems such as forests, where vegetation forms distinct layers based on their vertical position. Each layer or stratum represents a specific group of organisms adapted to that particular level and its associated environmental conditions.

In a forest ecosystem, for example, the tallest trees occupy the uppermost layer, referred to as the canopy. Below the canopy, there may be an understory layer consisting of smaller trees and shrubs. Further down, there might be a layer of herbaceous plants, followed by the ground layer consisting of grasses, ferns, and other low-growing vegetation.