Biology

What system helps animals exchange carbon dioxide and oxygen?

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How many main kingdoms are there in the living world?
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Which condition is specifically found only in males?
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Which of these animals is cold-blooded?
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What are the small bones that make up a backbone called?
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What do we call the teeth we grind our food with?
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Why must ferns live in moist environments?
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What is the sticky part of the pistil called?
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What is another name for a baby frog?
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