Biology

What vitamin does the sun's ultraviolet rays help the skin produce?

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What sea creature was likely the cause of the mermaid legend?
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What happens to your skin's blood vessels as you exercise?
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What food group is the largest?
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What is group of cells that work together and form an organ called?
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What is a shark's skeleton made of?
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What type of behavior is passed on from generation to generation?
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Which type of roots grow above ground?
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Which of these African grassland animals shares a food source with the zebra?
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