I know it might be too late, but I believe the answer is B) US research and design with mostly Asian production.
Answer:
space
Explanation:
As air gets warm, the air molecules have more energy and move around more, taking up more space. As the warm air expands, it becomes less dense than the cold air, so rises up and floats above the cold air.
Include or not include trace gases?
The r the good rock
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