Kyle, a $5-$year$-$old boy, has been growing by leaps and bounds; his height is $100\%$ above normal for his age. He has been complaining of headaches and vision problems. A CT scan reveals a large pituitary tumor. $($a$)$ Which hormone is being secreted in excess? $($b$)$ What condition will Kyle exhibit if corrective measures are not taken? $($c$)$ What is the probable cause of hiS headaches and vision