The atmosphere exerts a force (pressure) on Earth. Why does the atmosphere exert pressure on Earth?

this allows people to make the best decision or pursue the best option. when alternatives are weighed using their advantages and disadvantages, the option whose disadvantages outweigh the advantages (based on a qualitative or quantitative analysis) are shunned while those whose advantages outweigh their disadvantages are pursued.  

the correct choice is a .

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unlike poles attract