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

explanation:

the universal gravitation equation. since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. if the mass of one of the objects is doubled, then the force of gravity between them is doubled.

the answer is c on e2020, bud.