Biology

What is the basic unit of function and structure in living organisms?

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What group of animals has hollow bodies and stinging cells?
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Where in the body is blood produced?
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How many inches in length is the typical human esophagus?
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What is a full set of bones called?
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What arctic sea whale has one long horn on its head?
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What natural biological defense system protects the body from disease and fights off germs?
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What animal has the largest brain?
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Which of these creatures is a one-celled organism?
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