Biology

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

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What are the small bones that make up a backbone called?
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Which of these animals might use a coral reef for hiding and protection?
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What type of worm is an earthworm?
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What is the opening in your eye called?
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A person able to use both hands with equal skill is called what?
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What element are the bases of DNA mostly comprised of?
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In what season do the leaves of some trees turn colors and start falling to the ground?
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Who devised a simple test to determine the health of newborns?
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