There is a relationships between the number of stomata and the environment.
Explanation:
The small pores beneath the epidermis of a leaf is the stomata from theis opening gaseous exchange takes place,water evaporates and oxygen goes out. Stomatal density may increase or decrease the response due to environmental variations in the presence of sunlight and water availability. The opening and closing of stomata are controlled by guard cells. Through the stomata the process of transpiration occurs. the roots absorb water and excess of water evaporates by means of stomata.One fact is leaves under sunlight have higher stomatal density than leaves under shade.
When two species live in different habitats is called ecological isolation or habitat isolation. The two species can interbreed but they are not likely to meet each other. For example one species occupy forest canopy, while the other lives among the vines of a rain forest. This is an example of prezygotic barrier of speciation.
