Area code 917 is a telephone area code for all five boroughs of New York City (Brooklyn, Manhattan, Queens, Staten Island, and the Bronx).
An observation is something you saw happen whereas an inference is something you think will happen. You can guess that the water will fall through a static filled comb, but you observed the water moved away from the comb instead. (I saw this happen and I thought it was so cool)
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Muscle tissue would break down to supply amino acids.
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4 Charles Darwin was not able to explain the variation
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A. makes more copies of a sample of DNA