What is the longest and tallest mountain system in the world?
a. karakoram range
b. hindu kush
c. himalayas
d. zagros mountains

C. Himalayas

Explanation:

It is the longest and tallest mountain system i.e 29,029 miles followed by Karakoram range i.e 28,251 miles. Being one of the most ancient and oldest systems of mountain ranges in the world.  The Himalayas, being a young fold mountain range starts at the north of the Indian subcontinent being home to great peaks like Mount Everest of Nepal with 8,848 meters. Extending to Bhutan, Nepal, and Pakistan.  It remains snow-covered throughout the year and is composed of granitic rocks, formed due to the collision of the Indo-Eurasian plate. Huge altitude and complex topography make this place a cold desert. Having a length of 2,000 km and 2,500 km.

East european plain and russian russkaya ravina.

Ba population changes in response to a change in environment