Dylan has been going through some physical changes since he started high school. In the past 3 months, he’s already grown 5 inches taller. He’s been growing so fast the joints in his bones started hurting. His voice has been cracking and it’s recently become very deep, which also surprised him. He visits the doctor to talk about this. The doctor says the voice change is a normal part of going through puberty, but there might be a hormonal imbalance to cause the rapid height change. Questions
Which hormone is causing Dylan to grow so fast?

Does Dylan have too much of the hormone, or too little? Explain your reasoning.