Build several models of his tree house out of different materials, and see which model holds up best to wind, water, and ice.
<span>people with an impulsive personality have a higher rate of substance abuse and dependence.</span>
The answer is An object is in motion if it changes position relative to a reference point. You assume that the reference point is stationary, or not moving.
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igneous rocks that is the answer
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where is the picture or what is it talking about?
