Biology
What type of system circulates blood around the body?
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Some insects in the north produce what chemical to serve as a natural antifreeze in the winter?
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Where are the female sex cells of a flower located?
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What cells carry messages from all parts of the body to the brain?
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How many inches in length is the typical human esophagus?
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What is the basic unit of function and structure in living organisms?
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What is an action that one animal uses to influence or inform another animal?
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