Which of the following is the most likely cause for future water shortages?
a. global warming
b. increased agriculture
c. water pollution
d. erosion

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

In which layer do organisms on earth love?

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm