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:  -  The cracks get very long and big in some places - The earth places pressure against the rocks on both sides of the cracks - The pressure causes the rocks to press against each other very hard - The cracks continue to develop - The earth moves against itself on both sides of the cracks - The pressure and movement around the cracks causes the rocks to crumble in some places - A lot of energy is released - The energy causes seismic waves - The seismic waves move the earth in an earthquake.
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The answer is:
The earth develops cracks deep beneath the surface

input question: What is the missing first step of the following process:  -  Once in the lungs, oxygen is moved into the bloodstream and carried through your body - At each cell in your body, oxygen is exchanged for a waste gas called carbon dioxide - Your bloodstream then carries this waste gas back to the lungs where it is removed from the blood stream and then exhaled - Your lungs and respiratory system automatically perform this vital process, called gas exchange -???
output answer: He air we breathe contains oxygen and other gases

What is the missing first step of the following process:  -  Blood is carried to the kidneys through the renal arteries - The kidneys contain filters inside - The filters capture the waste products - The waste is combined with water to make urine - The urine leaves the kidney and is collected in the bladder - The cleaned blood is returned to the body.
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Answer: Waste products are deposited in the blood

Q: What is the missing first step of the following process:  -  The egg hatches - A larva emerges - The larva eats and grows - The larva sheds its skin - The larva enters a chrysalis - The pupa grows inside the chrysalis - The adult butterfly exits the chrysalis - The adult butterfly is now fully grown - The adult butterfly lays more eggs.
A: A butterfly starts as an egg

[Q]: What is the missing first step of the following process:  -  The oxygen travels into the lungs - The oxygen binds to hemoglobin proteins within erythrocytes (red blood cells) - The erythrocytes are pumped through the body by the heart - All cells receive the oxygen.
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[A]:
Oxygen enters the body through the mouth or nose