Biology

Which organ in the human body pumps blood?

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How many chromosomes does a typical human body cell have?
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What characteristic could show that a bird might be ready to reproduce?
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What nutrient group gives long-lasting energy?
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What are the long strands of genetic material in the nucleus called?
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What is the correct order of a butterfly's life cycle?
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Historically, which pathogen or disease has killed the most people?
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What powdery substance contains the male sex cells of a flower?
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What takes up 50-70 percent of a whale's weight?
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