Science

Which of these best describes how light travels?

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What system of measurement is used in science?
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Which parts of a nerve cell send out signals?
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Which of these animals is a mammal?
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About how often does Halley's Comet return?
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At what temperature fahrenheit does water freeze?
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Which planet is named for the Roman goddess of love?
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What was the name of the first artificial satellite launched into space?
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What vascular plants do not have seed-bearing flowers or fruits?
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