In 2010, East Fremont had a population of 10 million people, a birth rate of 7.2%, and a death rate of 2.2%. If the birth and death rates remain constant, in how long will the population will be close to 40 million people?

d.

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i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%