William harvey discovered circulation. first, as he tightened a bandage around an arm, he noticed that the fingers turned blue and cold. then, he used a less tight bandage and noticed that the hand swelled. with further research, what conclusion was he able to draw base from his experiment? a. the blood moving toward the hand contains oxygen. b. the blood moving away from the hand picks up oxygen. c. veins carry oxygenated blood and are deep in the skin. d. arteries carry deoxygenated blood and are deep in the skin.

Based on the experiment, Harvey concluded that THE BLOOD MOVING TOWARDS THE HAND CONTAINS OXYGEN. The correct option is A. The blood carry oxygen and nutrients round the body for body cells to use. The blood moving toward the hand contains oxygen and some other nutrients. When a tight bandage was put around the hand, the blood circulation was cut off, the blood was not able to supply the needed oxygen to the cells in the hand, as a result of this deprivation, the fingers of the hand turned blue and cold. The situation was rectified when the blood circulation was restored.

Cells of an organism tell each other when predators are near.