They are the last ones to die or get extinct
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The best answer is B
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<span>Factors contributing to the west ward expansion of the United States include the discovery of gold, the Homestead Act, and the desire for adventure, land and riches. The answers are the third, fourth and fifth statements among the choices that you have included or posted.</span>
It is because plates under oceans and land shift and move. Hope this helps. Brainleist Please I only need one more!!
