What is the part of the human eye that has a color called?

Which is the link between heredity and tobacco addiction

Where does peer pressure come from? a.the power of culture b.the influences of others c.people who purposely try harm you d.the messages in tv commercials

1. controls how much sugar is in the blood pancreas 2. controls the other glands pituitary gland 3. manufactured by the brain to relieve pain thyroid 4. gland that regulates the body's energy levels endorphins