the independent variable, the one that is intentionally manipulated, is whether or not the car hits the barrier.
the dependent variable, the one that you measure the response in, is the distance that the washers travel.
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i would think it's food chain
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pecialized keyboards
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When seismic waves hit a fault, the waves are reflected off the fault. seismograph can detect these reflected seismic waves. geologists then use these data to map the fault's length and depth
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