Once he cut it off, he could use it as a weapon because it's powers still worked, so if someone attacked him he could just whip it out and use it as a weapon to turn his enemies to stone, which he does on few occasions and wins the fights that would either be impossible or much harder for him.
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"People must take action now to protect coral reefs by reducing pollution and emissions of noxious gases." An opinion is a statement that expresses a judgement or viewpoint. All of the other statements express facts, they can be proven to be true.
C and D are correct i believe.
