He could race multiple cars with different weight added on them and do multiple races (just to be sure) and see if his theory was correct, if not he should right down what he has learned from his experience! :D
-You'll never learn if u don't try ;)
The break is outbreaks and the type is salt water
The best and most correct answer among the choices provided by your question is the first choice.
The best analogy would be: the body storing energy is like a car holding gas: the car's gas tank keeps the gas until it is needed.
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The second one I believe.
If an invasive species is added into a food chain/web, it becomes overpopulated/a pest because it has no natural predators.
It can also disrupt the food chain/web by eating the food supplies of the native organism leading to competitions.