The amount of variability within a group that is due to genetics is known as what?

A reward that consists of taking away something unpleasant is called

a. positive reinforcement. c. extinction. b. negative reinforcement. d. punishment.

Sean has a headache. It developed gradually throughout the day. He feels like a tight steel

band is wrapped around his forehead resulting in a dull steady pain on both sides of his head. His headache is best most likely a ______ headache. a. cluster c. sinus b. sinus d. tension