How is 'stratification' represented in a forest ecosystem?

Explanation

Stratification is the way in which different species in an ecosytem are placed or arranged in a habitat. It is a way of minimising competition for limited resoures, vital for survival. Vertical Stratification in a forest ecosystem is represnted by following parts of plants:
i) The herb layer.
ii) The shrub layer.
iii) The small tree layer.
iv) The canopy layer.