[Q]: What is the missing first step of the following process: - The lungs expand - Air is pulled from outside the body, into the lungs - The membranes in the lungs collect oxygen molecules - Oxygen is transferred to red blood cells - Red blood cells distribute oxygen throughout the body -
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[A]: The diaphragm contracts

[Q]: What is the missing first step of the following process: - The water tank over the boiler is heated - Creates steam - The steam is funneled to the piston - Piston uses the steam as energy - The piston causes the crankshaft to move.
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[A]: Coal is heated in the boiler

[Q]: What is the missing first step of the following process: - The cold water forms ice crystals - The ice crystals grow by absorbing surrounding water droplets - Form snowflakes - The snowflakes fall to the ground.
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[A]: Water in the clouds becomes very cold

[Q]: What is the missing first step of the following process: - They are born and are a baby - The baby grows into a child - Puberty turns the child into an adolescent - The adolescent becomes an adult - An adult becomes an elderly person - The elderly person dies.
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[A]:
There is a fetus in the womb