The troposphere is the lowest level of the atmosphere, so it is in contact with the Earth's surface. In contrast, the stratosphere is located above the troposphere, so it is not in contact with the Earth's surface. ... The air density and air pressure are much lower in the stratosphere.
Answer:
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To promote the reliability and potential of eco-cars.
It is not all of the above because c is incorrect i dont think a is right either so i would go with b good luck!
I would have to go with D.Old age slows even the most productive and hard-working people.
