How do veins return blood to the
heart?
A. using simple and
facilitated diffusion
B. using osmosis and
simple diffusion
C. using capillaries and
arteries
D. using valves and muscle
contractions

You are observing different types of cells in your science lab. one cell has many chloroplasts. what is the most likely function of this cell? a. energy production b. photosynthesis c. reproduction d. digestion