Problem: What is the missing first step of the following process: - Put the ice cube tray in the freezer - Wait 5 to 6 hours - Take the ice cube tray out of the freezer - Bend the tray slightly to get the ice cubes out and into a drink.

A: Put water in an ice cube tray

Problem: Given the question: What is the missing first step of the following process: - Engines produce carbon dioxide - Living things produce waste - Waste decomposes - Decomposition produces methane - Water evaporates - Water vapor joins the atmosphere - Carbon dioxide, water vapor and methane are greenhouse gases -
++++++++++++++++++++++++++++++++
The answer is:
People breathe and expel carbon dioxide

input question: What is the missing first step of the following process: - The lungs have a series of smaller and finer tubes and sacs - Air reaches the smallest and finest air sacs called alveoli - Oxygen travels from the alveoli into the blood - Oxygen-rich blood is carried to the heart - Oxygen-rich blood is pumped throughout the body by the heart - Cells take in the oxygen rich blood and release carbon dioxide rich blood - The carbon dioxide rich blood travels to the lungs - Carbon dioxide travels through the throat and is exhaled.???
output answer: Air enters the nose or mouth and travels through the windpipe into the lungs

What is the missing first step of the following process: - The flashlight is turned on - Two contact strips touch one another - A circuit is completed between the batteries and the lamp - The lamp in the flashlight begins to glow - The reflector in the flashlight directs the lamp's beam - A straight beam of light is generated - The flashlight is turned off - The circuit is broken - The beam is no longer visible.
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Answer: Batteries are put in a flashlight

Q: What is the missing first step of the following process: - 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 - Carbon dioxide released when you exhale.
A: You breathe air in

[Q]: What is the missing first step of the following process: - Put the pot over a source of heat - Turn the heat on - Wait for a few minutes - Begin to observe small bubbles in the water - Wait until the water starts to bubble a lot - Wait until you can see steam rising from the water - Turn the heat source off - Take the pot off of the heat source.
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[A]:
Add water to a pot