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I turn my head you may go where you want; I turn it again you will stay where you are. I have no face, and I live/die by my cricket teeth. What am I?

Im having trouble with the following concepts,so any help is appreciated Use the oxidation number method to balance the following redox equation 2Al+3I2-->2Al(3+)+6I(-) Identify each of following changes as oxidation or reduction half reactions. Al+I2-->Al (3+)+I(-) MnO2+Br(-)-->Mn(+2)+Br2