I believe the primary determinant of basal metabolic rate is the Lean Body Mass. Basal metabolic is the rate of energy expenditure per unit time by animals at rest. It comprises the processes that the body requires to function. It is the amount of energy per unit time that a person need to keep the body operational at a state of rest.
Mass transit can help reduce air pollution in urban cities because there are fewer cars on the roads, creating less pollution.
...the results of natural and unnatural processes, and of interactions of the physical components of the planet on the environment.
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The core, or middle, of the Sun is the hottest part. Hot gasses bubble up from the core to the surface of the Sun. When the gasses burn, heat and light are produced.