I think it is natural selection. genetic variation also could be a factor for physical variation over the years.
Do u mean ur anatomy organs??
Talking to friends/family
having alone time to yourself, meaning doing something you like or relaxing
sleep
i hope this helped if this is what you were asking for
<span>Hecht jump A jump executed from the highest of two asymmetrical bars in which the body is folded around the lower bar and continues to circle until the legs point down at a 45-degree angle. The body is then extended from the hips as the gymnast jumps to the floor with legs straightened and arms extended.</span>
