Biology

How many main kingdoms are there in the living world?

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What is the inability to digest the predominant sugar of milk?
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What kind of plant stem is soft and green?
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Which of these animals is a cnidarian?
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What layer of the skin is just below the surface?
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Which of the following animals live in large groups for protection?
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About how many cells does an adult human body have?
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What grows from an acorn?
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What is the biggest artery in the human body?
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