Why are there many natural areas in the Himalayas?

The Himalayas are the highest mountain system of the Earth, that is, they are mountains. The distribution of various natural zones in this area is due to the fact that the vegetation is distributed in layers: swampy jungles, tropical forests, coniferous, deciduous, etc. are replaced from the bottom up. Mountain steppes and semi-deserts dominate in the northern parts. At the foot of the mountains, dry, coniferous trees prevail, and then more dense deciduous trees. In the eastern part there are swampy forests, something like a jungle (terai), where trees with valuable timber grow. Thus, it can be concluded that due to the height of the mountains and the different distribution of precipitation, and the oxygen level at a certain height of the mountains, they affect the different distribution of the natural zones of a given territory.