[Q]: What is the missing first step of the following process: - The lungs remove oxygen from the air - Oxygen diffuses from alveoli in the lungs to the bloodstream - Hemoglobin in red blood cells attaches to the oxygen - Red blood cells carry oxygen all around the body - Oxygen diffuses into cells from capillaries.
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[A]: Air goes into the lungs

[Q]: What is the missing first step of the following process: - The aluminum is collected - Taken to a treatment plant - The aluminum is sorted and cleaned ready for reprocessing - The aluminum is re-melted - Turned into molten aluminum - The aluminum is made into large blocks called ingots - The ingots are sent to mills to be rolled out - The rolled out product is made into new aluminum products.
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[A]: The consumer throws aluminum cans and foil into a recycle bin

[Q]: What is the missing first step of the following process: - An electrical source, like a battery, produces an electrical current - The electrical current flows through the wire - The electrical current creates a magnetic field around the wire, magnetizing the metal - The magnetic field can be turned on and off by starting or stopping the electricity source -
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[A]: A conducting metal, like copper, is wrapped around a piece of metal

[Q]: What is the missing first step of the following process: - Egg is produced after fertilziation - Mother sits on egg until it hatches - Bird Hatches - Grows up - Flee the next - Starts family - Dies.
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[A]:
Two birds meet each other