The answer is: [C]:
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"the number of people who live in a square mile or kilometer" .
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Let us examine the other answer choices:
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Answer choice: [A]: "</span><span>an increase in the number of people living in an area over time" — refers to: "population growth".
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Answer choice: [B]: "<span>a decrease in the number of people living in an area over time" — refers to: "population decline"; or, "depopulation".
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Answer choice [D]: "</span>the number of live births per one thousand people in a year" — refers to: "birth rate". (as opposed to: "the number of deaths per one thousand in people in one year" — which refers to the "death rate"; or, "fatality rate").
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The northern sea route takes them thru artic waters and the water often freezes creating damage and delays
Unit and measurement
One g is the force per unit mass due to gravity at the Earth's surface and is the standard gravity (symbol: gn), defined as 9.80665 metres per second squared, or equivalently 9.80665 newtons of force per kilogram of mass.
Answer:
I belive the answer is C It protects the earth from solar radiation
