Leeches and alligators symbiosis relationship is called parasitism. Leeches feed on the blood of alligators in their mouths, causing harm to the alligator, but benefiting the leech in nutrients.
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I think the answer may be chosen from simply going through each answer and using common sense.
In my opinion, the answer is "A. E<span>xercise increases oxygen supplies throughout the body, which helps in the handling of stress." Reason(s) for picking this answer: It gives an educated answer to WHY it handles stress.</span>
The correct answer should be gymnastics. While the other mentioned sports could help him too, gymnastics is the most comprehensive one because it involves almost every muscle in the body to do various exercises, whereas biking would increase his leg muscle fitness most, but would not do much for the rest of his body.
There’s not really a definite answer- but the most lethal drops occur from 20-50 feet, yet there have been cases of phonomena in which someone can survive a fall from a plane.
