[Q]: - Chemicals like sulfur dioxide and nitrogen are released into the air - These substances rise into the high atmosphere - They react with water and oxygen - This creates a more acidic rain What might be the last step of the process?
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[A]: The rain with the high acid content falls.

[Q]: - Skin is cut or damaged - Bacteria enters through the wound - The bacteria reproduces and spreads - Causes symptoms What might be the last step of the process?
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[A]: The bacteria is either fought off or becomes a disease.

[Q]: - Sediment settles in a place due to gravity - The sediment breaks down into small particles - Wind or water picks up the sediment - The sediment travels along the same route as the wind or water - The sediment is deposited at new locations by the wind or water - The sediment is picked up again by new wind or water - The sediment travels further What might be the last step of the process?
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[A]: The sediment is deposited again in a new place.

[Q]: - A larva is born - The caterpillar eats constantly until it grows bigger - The caterpillar starts to form a cocoon around itself - The caterpillar becomes a pupa - After some time the cocoon hatches What might be the last step of the process?
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[A]:
And a butterfly is born.