How do hormones affect the physical and psychological aspects of puberty?

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Please answer these 2 question in a maximum of at least 70 words each. It is worth 40% of my grade.
Question 1: How do hormones affect the physical and psychological aspects of puberty? Be specific by giving examples.
Question 2: Explain the difference between identity achievement and role confusion. Why do you think establishing an identity is important at this stage?