The answer is (2) maintaining a stable internal environment.
Homeostasis is the process by which an organism tries to stabilise the internal body metabolism in response to external disturbances or changes. Example, when a person goes out into the snow, his body process will get overwhelmed by the sudden drop in the temperature. The body will try to stabilise its internal temperature by producing more heat in response to the cold exterior.
Answer: Food can be an obvious answer because people will not survive without food so they will die. And death means there will be a decrease on population size. So food can be a limiting factor that is dependent on population size.
because coal-powered electrical plants produce air pollution, which is one of the main causes of global warming, so if it was substituted for hydroelectric or geothermal sources the amount of air pollution would decrease greatly.
