The correct option is B Stratification
In
a particular habitat, the distribution of organisms is neither uniform nor random,
instead, they remain organized on the basis of pattern diversity. There are
various types of patterns in ecology. However, the patterns of the spatial
distribution of organisms are mainly of two types - zonation and
stratification. Zonation refers to the horizontal segregation of organisms in a
community. Whereas, stratification is defined as the vertical layering of a
habitat. For example, a typical forest community comprises of several vertical
layers of stratification, including - [i] subterranean, [ii] forest floor,
[iii] herbaceous vegetation, [iv] shrubs, [v] canopy layer etc. On the other
hand, ecotone refers to the transitional zone between two adjacent communities,
such as the intermediate region between a forest and a grassland.