Answer:
Two kidneys
Explanation:
Most people have two kidneys, however, it is possible to live a healthy and active life with only one functioning kidney.
The answer is the second option.
The first and fourth options do not involve fitness equipment.
While the third option includes "the heaviest weights," they are the results of "three complete workouts," not the means to a healthier lifestyle.
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A scientific model is a representation of something in the natural world. Models allow scientists, such as marine biologists, to study things that may be too large, too small, or in some way too difficult to study.
