input question: What is the final step of the following process: - Acid rain flows through soil - Chemicals from the acid rain kill plants and trees - The acid rainwater flows into rivers and streams - The chemicals kill fish - The chemicals kill animals that drink the water - Nitrogen builds up???
output answer: Nitrogen destroys fish and shellfish populations.

What is the final step of the following process: - An airline reservation is made - The passenger arrives early at the airport - The luggage is checked - The passenger waits in line - The passenger shows their identification and gets a boarding pass - The passenger goes to their gate - The passenger gets in line when it's time to board - The person boards the plane - The plane arrives at the destination
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Answer: The passenger gets off the plane at their destination.

Q: What is the final step of the following process: - A bird lays eggs in a nest - The parent(s) incubate the eggs - The eggs hatch - The mother (and sometimes the father) bird take care of the baby birds - The baby birds grow up and get their flight feathers - The young birds learn to fly and leave the nest
A: The adult birds find mates and mate.

Question: What is the final step of the following process: - Wind passes the turbines and moves the blades - The shaft of the turbine spins - Shaft is connected to a generator - The generator uses the spins of the shaft to rotate a rotor - The rotor spins inside the core, which has magnets inside surrounded by wire loops inside
Answer: The spinning of the rotor in the core generates electricity

[Q]: What is the final step of the following process: - Carbon dioxide from the air passes through small pores (holes) in the leaves - These pores are called stomata - Water is absorbed by the roots and passes through vessels in the stem on its way to the leaves - Chlorophyll absorbs the sun's energy - It is this energy that is used to split water molecules into hydrogen and oxygen - Oxygen is released from the leaves into the atmosphere
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[A]: Hydrogen and carbon dioxide are used to form glucose or food for plants.

Problem: Given the question: 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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The answer is:
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