What enzyme breaks down starch in your saliva?
pepsin
trypsin
lipase
amylase

Indica el nombre y la fucion de los vasos sanguineos que entran y salen de los riñones

Which of the following is an effect of the uneven heating of the earth by the sun? a sea breeze a land breeze a convection current all of the above

Veins have a much lower blood pressure than arteries. which of these prevents backflow of blood in veins? a. pressure applied by the heart b. one–way valves in veins c. thin muscular walls of veins