This would be they stay together, through good times and bad.
hope this helps!
Answer:
a change from one day to the next day
<span>The correct answer is D. When exercising in the heat, you should vary the intensity and duration of the exercise. Wearing tight-fitting clothing will not cause your sweat to be absorbed, wearing layers will cause your body temperature to rise even further, and wearing black clothing will cause more heat to be absorbed. Therefore, all of the alternative answers will not help contribute to a healthy exercise routine.</span>
If they can learn more about how the human body ages,why some people live longer than others then perhaps they could apply these different facts in order to eventually discover our lifespan.