The lowest level of stimulation that a person can consciously detect 50 percent of the time the stimulation is present is called

Energy derived from hot rocks and fluids beneath the earth’s surface is

All but one describes an effect of aging on the digestive system. a) decreased acid secretion b) decreased elasticity of stomach c) capacity to resist damage decreases d) food remains in stomach for less time

Which of the following is the sl unit used to measure temperature a. kilogram b. liter c. meter d. kelvin