- Major himalayas
- Inner himalayas
- Marginal himalayas
There are sub-regions.The diversity of ecosystem can be studied on the basis of these sub regions.
2.Biological aspect
Because of diversity in physography and climate the himalayan region has become an area and habitat of various plants,agricultural crops, wildlife and other animals.Barlely awa,buckweat and maize are produced here.Similarly green vegetables ,potato and radish are also produced here.Apples ,lemons and some other green vegetables are produced here,some fruits are also grown.Rice is cultivated in some parts of the valleys.Somewhere there are pine forests and grasslands,rhododendron ,pyried,bushes and other trees are found.These are inseparable components of the ecosystem in these region.The animals tolerating difficult situation of cold ,less oxygen can live here.This is their physiological and inherited capacity.
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