Biology

What body system is the human heart part of?

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In which kingdom would a toadstool fit?
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What animal builds lodges, dams up rivers and has large front teeth for gnawing?
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Which of the following animals might a heron eat?
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What is the biggest artery in the human body?
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What was the dominant invertebrate of Mesozoic seas?
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Which of these do organisms use to make energy?
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How long can an anteater's tongue get?
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Historically, which pathogen or disease has killed the most people?
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