Response to stress or danger that increases the heart rate and blood pressure, preparing the body to fight or flee: 2. The ‘feel-good’ hormones such as serotonin so you feel less pain:
3. Controls how much sugar is in the blood maintains balance to prevent diabetes:
4. What time you go to sleep and when you usually wake up in the morning:

Response to stress or danger that increases the heart rate and blood pressure, preparing the body to fight or flee: Adrenaline

The ‘feel-good’ hormones such as serotonin so you feel less pain: dopamine

Controls how much sugar is in the blood maintains balance to prevent diabetes: Insuline

What time you go to sleep and when you usually wake up in the morning: Melatonin

halogen, any of the six nonmetallic elements that constitute group 17 (group viia) of the periodic table. the halogen elements are fluorine (f), chlorine (cl), bromine (br), iodine (i), astatine (at), and tennessine (ts).