Obesity is body weight that is normal for particular age ,sex and height

Which of the following requires the action of a first class lever in the body

What kind of wound occurred when the skin scrapes against a hard surface and tiny blood vessels break in the outer layer of skin

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