Science

What is the name for a tool that makes work easier to do?

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What are solid particles that produce color by absorbing or reflecting light called?
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What is a dark area that light does not reach called?
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In which of the following animals does the male give birth to the young?
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How many Earth years does it take Mars to go around the Sun?
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What distinction does Mira (Omicron Ceti) hold in astronomy?
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One kilogram is equal to how many pounds?
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What is a storage device for electricity called?
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Marie Curie spent much time studying which of these subjects?
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