Problem: Given the question: - 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 - What might be the first step of the process?
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The answer is:
A conducting metal, like copper, is wrapped around a piece of metal

Problem: Given the question: - A muscle fiber gets a signal from its nerve - Proteins and chemicals release energy to either contract the muscle or relax it - When the muscles contracts the bones connected to he muscle are pulled closer together - When the muscle relaxes the bones move farther apart. What might be the first step of the process?
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The answer is:
Muscles work by expanding and contracting

Problem: Given the question: - 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 - What might be the first step of the process?
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The answer is:
People breathe and expel carbon dioxide