Biology

What color is a polar bear's skin?

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What do red blood cells carry throughout the body?
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What is the expected time an organism will live called?
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What body system is the human heart part of?
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Which of these animals is a cnidarian?
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How many stages of sleep are there?
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What is the leaf of a fern called?
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Which of the following is the smallest?
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Which one of these activities are a part of a plant's life cycle?
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