The easy experimental answer to this question is 264 hours<span> (</span>about 11 days<span>). In 1965, Randy Gardner, a 17-year-old high school student, set this apparent world-record for a science fair. Several other normal research subjects have remained awake for eight to 10 days in carefully monitored experiments.</span>
Answer:
b
Explanation:
its b because it doesnt say any else then 15 or any clues so its tryna trick u
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PCR is a useful technique because it is used to amplify small segments of DNA.
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The answer would have to be A) because cold air is dense so it is able to quickly plow a warm air mass ahead of it.