Science

In math, "pi" is equal to?

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What are many cells that form together to provide a certain function called?
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What tool do people at sea use to measure distance with echoes?
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What is the sticky bacteria that forms on teeth and gums?
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Who is responsible for the Lost Continent of Atlantis theory?
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Which parts of a nerve cell send out signals?
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Which of the following characteristics is the force of gravity dependent on?
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Which of these is a famous astronomer for whom a comet was named?
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Distance equals speed times what?
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