Cool front is not a standard weather front. Cold front, warm front and occluded front are all standard weather front. When you say weather front, it is a boundary that separate 2 air masses.
Answer: If it comes closer, make yourself look larger and make lots of noise. If it still continues to come closer then spray (or throw) water at it. A raccoon that is too aggressive or too tame may be sick or injured.
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Answer:
A) 1000
Most viruses are 1000 times smaller than the average cell
The answer is "A hypothesis is tentative statement" and "A theory has a strong predictive power."