Biology
What natural biological defense system protects the body from disease and fights off germs?
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What will happen to crops if they do not get enough water while getting too much heat?
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What system helps animals exchange carbon dioxide and oxygen?
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What adjective means belonging to or associated with a flower?
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How many pairs of ribs are in a typical human body?
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About how many cells does an adult human body have?
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What can be made from the particles of a dead virus to prevent the disease caused by that virus?
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Which of the following is made from nervous tissue?
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