Biology

What natural biological defense system protects the body from disease and fights off germs?

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What protein is found in the hair and nails of mammals?
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What is made by white blood cells to help fight off infection?
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Trisomy-21 is popularly known as what?
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What are the small bones that make up a backbone called?
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In which part of the bone is blood made?
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What group of animals has hollow bodies and stinging cells?
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Which of these characteristics allows an owl to see well at night?
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What do we call the teeth we grind our food with?
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