Oxygen diffuses from the to the where it enters red blood cells.
a. plasma membrane, alveolus
b. capillary, artery
c. alveolus, capillary
d. artery, plasma membrane

Which of these is true for bacteria because they are prokaryotic cells? a. they can engulf body cells in order to make memory cells. b. they must invade viruses in order to reproduce. c. they are much larger than eukaryotic body cells. d. they can reproduce on their own outside of other cells.