What does the term RACE mean in trying to do language homework?

define the term race and ethnicity.

I am not sure what race is, please give me an example on how to define race and ethnicity.

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For what does the Race to the Top contest award states?

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5. A race car travels on a racetrack at 44 m/s and slows at a con- stant rate to a velocity of 22 m/...

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