Sheena has volunteered to participate in an experiment in which she has to wear a pair of glasses that invert her vision. after about a week, she is able to perform her usual tasks, like riding a bike or reading a book. this is a result of perceptual

gold discovery in california, and pioneer settlers were sometimes pulled west because they wanted to make a better living. others received letters from friends or family members who had moved west. these letters often told about a good life on the frontier. the biggest factor that pulled pioneers west was the opportunity to buy land.

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