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The correct option is A.
Multiple trial of an experiment normally improve the reliability of the experiment. Repeating an experiment several time using the same procedure usually increase the accuracy of the data obtained. The average of these data can then be calculated to obtain as near accurate result as possible.
Answer:
Stratosphere
airline pilots prefer to operate in the stratosphere
Answer: Cornea
Explanation: The cornea is the only part of a human body that has no blood supply; it gets oxygen directly through the air. The cornea is the fastest healing tissue in the human body, thus, most corneal abrasions will heal within 24-36 hours.