Because it needs to be able to be proven and it avoids being incorrect.
Answer:
The problems that is represent Dubai are the follows:
-Rely heavily on oil
-Spend a lot of energy
-Don't have Parkland
Explanation:
This city is compose for all technologies and nothing of rural or other things that help to the environmental, need more Parkland but this city increase a lot how city.
Answer:
After a glacier melts, it leaves a trail of debris, made up of rocks, grit, and soil, along the side of a valley.
Explanation:

El Nino. It replaces the normally cool water with warm water from the west.
Answer:
Mithochondria.
Explanation:
You may have heard the phrase "mithochondria is the powerhouse of the cell". This is because, embedded in the inner mithochondrial membrane, there is a protein that is capable of creating ATP by using the energy that results from dissipating the chemoelectric potencial between the intermembrane space and the mithochondrial matrix, by bombing protons (that came from the degradation of sugar) to the mithochondrial matrix.