Biology

What are the thin bones that protect your lungs and heart?

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What do red blood cells carry throughout the body?
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Which of these do organisms use to make energy?
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Lithium is used to treat which of the following?
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Which of the following correctly names the top layer of the rain forest?
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What does the sea urchin use to help protect itself?
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What do we call an area that an animal defends from other animals?
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Which of these snakes is a pit viper?
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What does a king cobra use to immobilize and kill its prey?
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