Hey there!
Airplanes must be pressurized when flying at high altitudes so that the oxygen levels stay normal for us to breathe. The higher you go up, the thinner the air gets, which causes breathing problems for us humans.
Thank you!
Answer:
Fast growth can create negative externalities e.g. noise pollution and lower air quality arising from air pollution and road congestion. Increased consumption of de-merit goods which damage social welfare. ... These externalities reduce social welfare and can lead to market failure.
Answer:
i think it is helium is burned oxygen and helium is light
Answer:
the answer is C
Explanation:
the World Climate Region ... and the World Population map) and their legends to guide you. a. C