Answer: A) this means the rock formed at the time when different plants and animals were alive.
answer on my paper
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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>
That would be the Himilayas. Hope that helped!