The most likely reason for this would be continental drift. It is believed that millions of years ago our world was one giant continent. This continent began breaking apart and drifting slowly more and more as millions of years passed by, ultimately creating the seven continents we know now. This would mean that Brazil and South Africa were most likely once the exact same location or the edge of where the continent broke apart. This would explain why the same rock was found in both locations.
Movement is the main function of muscular tissue. They have the ability to contract and this is what brings about the movement of body parts. They also help to maintain body posture and position.
