Biology

What body system is the human heart part of?

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Which of these organs can grow back if some of it is removed?
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What is the inability to digest the predominant sugar of milk?
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How many chambers make up the human heart?
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Which of these plants captures insects to get necessary nutrients?
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What part of a plant produces seeds?
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Which pair of animal species and types is correct?
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What does the sea urchin use to help protect itself?
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Which form of communication does a bird use?
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