Biology

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

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What is the fin on the backs of fish, some whales and dolphins called?
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Which of the following fish can adapt to both salt water and freshwater?
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What does the sea urchin use to help protect itself?
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What does the substance melanin control?
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What do you call the system of naming things?
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Where would you find two maxilla bones and two nasal bones?
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Which insect is known for its sting?
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What are scientists who study animals called?
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