Biology

What gives red blood cells their color?

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Which of these is a way dogs communicate with each other?
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Which of these is a sense that humans are known to have?
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What is the most diverse group of gymnosperms?
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Which of these senses do you use to tell what color an object is?
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What grows from an acorn?
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What type of plants has tube-like cells that help move water through the plant?
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Which of these is not an insect?
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Which is not a system of the human body?
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