[Q]: - The consumer throws aluminum cans and foil into a recycle bin - The aluminum is collected - Taken to a treatment plant - The aluminum is sorted and cleaned ready for reprocessing - The aluminum is re-melted - Turned into molten aluminum - The aluminum is made into large blocks called ingots - The ingots are sent to mills to be rolled out What might be the last step of the process?
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[A]: The rolled out product is made into new aluminum products.

[Q]: - The pancreas detects chemical changes in the stomach - The pancreas creates juices that help digest food - The pancreas releases the juices into the stomach - Trypsin and chymotrypsin digest protein - Insulin is produced to move glucose from the blood What might be the last step of the process?
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[A]: The enzymes begin producing again.

[Q]: - Plants start growing on or near the rocks - The roots of the growing plants start to break up the rock - The plant acids dissolve the rock - The rock is broken down into smaller pieces What might be the last step of the process?
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[A]: Erosion begins.

[Q]: - You breathe air in - Air enters bronchial tubes - Air is then split into the bronchioles of each lung - Bronchioles have alveoli which are tiny air sacs - Alveoli is surrounded by many small blood vessels - Oxygen passes through alveoli into blood vessels - Blood leaves the lungs as it travels through the body - Blood carries carbon dioxide back to the lungs What might be the last step of the process?
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[A]:
Carbon dioxide released when you exhale.