In nature, objects tend to move in arcs or some form of circular motion.
Its well observed when an object is thrown in the air and falls to the ground. The force of the throw makes the object travel forward, while gravity pulls it down to the ground, making it follow an arc.
The only exception to this is when an heavy object is dropped. It hits the ground in a stright path.
In living organisms, body parts; such as arms, legs, eyes, heads, tails, etc; operate in circular motions.
The drawing below demostrates this fact in the human arm.
Only mechanical devices operate in stright lines.
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