Hydrosphere and atmosphere. those are the only 2 spheres that interact with each other in the air.
because they have many population and many other countries visited the singapore because of the environment, beautiful place and etc..
Answer: not eating enough food, because cells need molecules from both food and air to work
Explanation: the air and food are creating energy for the organism
Answer：
China faces serious social and economic problems associated with overpopulation in the years to come. Overly populated regions lead to degradation of land and resources, pollution, and detrimental living conditions.
