Why are glass cylinders preferred over plastic cylinders for conducting lab experiments ?
a. they are attractive and light
b. they are cheap and abundant
c. they are heat and chemical resistant

The image below shows a common blood pressure gauge. what does this device do? a. measures the level of oxygen present in the blood b. measures the pressure of blood when the lungs expand and compress c. measures the electrical activity of the heart d. measures the pressure of blood when the heart contracts and relaxes

Need the diagram below, which is not drawn to scale, shows the position of the earth, moon, and sun. what type of eclipse occurs when the earth, moon, and sun are lined up in the order shown? a. planetary eclipse b. solar eclipse c. martian eclipse d. lunar eclipse

Substances that can pass through cell membranes by diffusion include a. na ions. b. proteins c. glucose. d. oxygen.