Science

What is the opening of a lens, which controls the amount of light?

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What liquid is used as a standard when measuring density?
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What kind of radiation can be described as infrared?
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Which star is the brightest star in the northern sky at night?
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What does the word "constellation" mean?
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What tissues connect the muscles to the bones?
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The image of an object when seen in a mirror is called what?
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What section of an insect's body are the legs and wings attached to?
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