input question: What is the final step of the following process: - Take out an ice cube tray - Fill the tray with water from the faucet - Put the ice cube tray in the freezer - Wait for several hours - The water will freeze and become ice - Remove the ice cube tray from the freezer???
output answer: Remove the ice cubes from the tray.

What is the final step of the following process: - You breathe in - Air goes through all the little branches in your lungs to fill up the air sacs, or alveoli - Oxygen goes through the walls of the alveoli and into the capillaries - The oxygen goes into the bloodstream - Oxygen is left and carbon dioxide is picked up
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Answer: You breathe it out through your lungs

Q: What is the final step of the following process: - 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
A: Opposing pairs of muscles exist in order to provide the necessary range of motion.

Question: What is the final step of the following process: - Blood enters the kidney - The blood travels into the neophrons - Waste is expelled via the neophrons - The waste goes to the bladder in the form of urine
Answer: The clean blood exits the kidneys.

[Q]: What is the final step of the following process: - You find an empty ice cube tray - You fill the tray with warm water - You carefully place the tray on an even surface in a freezer that is at least 32 degree Farhenheit, the freezing point of water - The water begins to get colder until it starts to freeze solid - The water expands as it freezes, one of the few liquids that has greater volume as a solid
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[A]: Because you used warm water, the gasses in the water had evaporated out, so you will have nice clear ice cubes without cracks from the trapped gasses

Problem: Given the question: What is the final step of the following process: - Pollution enters natural water sources such as rivers and lakes - The pollution negatively affects the water quality - The pollution negatively affects the health of plants and animals - The plants and animals have shorter, less healthy lives - The plants and animals do not reproduce very well - The number of plants and animals decreases over time - The quality of water gets worse and worse as there are no plants or animals to clean it
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The answer is:
Eventually there is nothing living in the water and it is unusable