<span>An element is a pure substance that cannot be broken down into anything simpler by physical or chemical means.</span>
A gene pool changes throughout evolution this could be natural selection, genetic drift or a mutation. A gene pool does this to adapt with the needs of the environment it is in
Earthquakes only occur at transfer boundaries where two tectonic plates will slide or rub past each other.
If there are no boundaries in mid-America, then earthquakes are not possible.
Hasty generalization hope it helps
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