What does it mean when someone has done multiple trials?
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OA. They have performed an experiment that can only be performed once.
OB.
They have performed an experiment once and reported their findings.
OC.
They have designed an investigation to answer a question.
OD.
They have performed a scientific experiment more than once.
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How is electrolysis most commonly used to produce an energy source? a - splitting water molecules produces oxygen, which organisms breathe to fuel their bodies. b - splitting water molecules produces hydrogen gas, which is used to power machines through hydrogen fuel cells. c - splitting carbon dioxide molecules produces coal, a form of carbon that can be burned to produce heat. d - splitting carbon dioxide molecules produces natural gas, which can be burned to generate electricity in power plants.