Final answer:
In a scrum, only the players' hands and arms are allowed to touch the ball.
Step-by-step explanation:
In a scrum, only the players' hands and arms are allowed to touch the ball. The scrum is a set piece in rugby where the forwards from each team bind together to contest possession of the ball. The ball is rolled into the middle of the scrum, and the players use their hands to try to gain control of it and pass it out to their team's backs.The combination of players' physical strength and momentum, alongside their gear, significantly influences the scrum's outcome, as each team attempts to push the opposing team backward and gain control of the ball.