input question: -  Air is drawn in through the mouth - The air goes down the esophagus - The air moves into the lungs - The carbon dioxide is removed - The remaining oxygen enters the body  What might be the last step of the process????
output answer: The remaining carbon dioxide is expelled through the mouth.

input question: -  A dam is built in an area prone to flooding - A large amount of rain occurs - The water builds up behind the dam - The dam opens its floodgates when it starts to get full - The water flows into a river below the dam - The dam closes its gates - The dam will occasionally open its gates again to gradually release more water  What might be the last step of the process????
output answer: Eventually all of the floodwater will be slowly released into the river without causing any flood damage.

input question: -  A butterfly lays an egg - A larvae matures inside of the egg - The caterpillar hatches from the egg - The caterpillar eats and grows - The caterpillar spins a coccoon around itself and forms into a pupa - The butterfly forms inside of the coccoon - The mature butterfly emerges from the coccoon - The butterfly mates  What might be the last step of the process????
output answer: The female butterfly lays eggs.

input question: -  One type of air pollution is the addition of carbon dioxide gas into the air - Some scientists believe that releasing too much carbon dioxide into the atmosphere is one of the causes of global warming - This upsets the balance of the carbon cycle - The ozone layer helps protect us from harmful rays from the sun - It is getting damaged from air pollution such as methane gas from livestock and CFCs from spray cans - Acid rain is created when gasses such as sulfur dioxide get high into the atmosphere - The wind can blow these gasses for miles and then they get washed out of the air when it rains  What might be the last step of the process????
output answer:
This rain is called acid rain and can damage forests and kill fish.