Problem: Given the question: - You inhale - The air enters the mouth and nose - The diaphragm contracts - Air fills all the sacks in the lungs - Oxygen passes through the sacks into capillaries - The blood is passed to the blood in the capillaries - The blood carries the oxygen to the heart What might be the last step of the process?
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The answer is:
The heart pumps the oxygenated blood to the body.

Problem: Given the question: - Sediment becomes loose from the rest of the soil - The sediment rolls down hill towards a river - The heavy items sink to the bottom - The lighter items float on the top and in convection cycles - As the river flows the sediment is moved - The sediment gets dumped through tributaries into lakes and the ocean What might be the last step of the process?
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The answer is:
The sediment keeps moving around the world in convection currents.

Problem: Given the question: - Electrical signals in the brain travel through nerves to muscles - Two types of proteins exist in filaments in the muscles - The filaments move when the brain instructs them to - The motion of the filaments cause the muscle to shorten and contract What might be the last step of the process?
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The answer is:
Opposing pairs of muscles exist in order to provide the necessary range of motion.