33. ethanol is the active principle in intoxicating drinks. a. true b. false

During the first month of development, how many layers of cells make up the embryo? a. 1 b. 2 c. 3 d. 4

The amount of oxygen that is actually used by the body during the rest or a hand workout is determined by the heart rate, the stroke volume, and the amount of a. blood circulating in the vascular system b. oxygen removed from the vascular system c. oxygen provided to the vascular system d. blood that individual has in the body e. hemoglobin in the red blood cells

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