The closer you get to the city the higher buildings get such as apartment buildings due to price of land
Answer:
mountain systems and fresh water
Explanation:
mountain systems are a group of mountain ranges with similarity in form, structure, and alignment that have arisen from the same cause, usually an orogeny. Take the Himalayan mountains for example.
Fresh waters are natural occurring waters except seawater and brackish water. for example they have lake Baikal,the Yangtze river etc.
6x^2 + 3xy - 2xy +y^2
6x^2 + xy + y^2
