Answer:
The air at higher altitudes is colder, less dense, and contains fewer oxygen molecules. This means that you need to take more breaths in order to get the same amount of oxygen as you would at lower altitudes. The higher the elevation, the more difficult breathing becomes
Explanation:
Answer:
movement of water into a cell through aquaporins
Answer:
OA by decreaaing the level of spending
Explanation:
The level of government spending is main problem .If we decrease the level of spending and creating necessary things in own country leads us to profit and makes us self dependence also.
They all went extinct so that why their are no animals in the world
