Natural Selection could produce new variations of body parts.
Answer:
0 meters
Explanation:
When we talk about displacement, think that the think of it as the measure of the distance between the starting point of the object, from its end point.
Since we are talking about a lap around a track, it would mean that the starting point is also the end point. So if you started and end at the same point, the distance between it would be 0.
Yes, that is true. However, a penis can temporarily enlarge from blood flow (an erection) or it can be surgically manipulated. Hope that helps!