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What do mucus, saliva, and tears have in common? a. they contain chemicals that attack pathogens b they contain vaccines against pathogens c. they are made of lymph d. they contain only water
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Coquina, a type of limestone, forms from shell fragments that settle on the ocean floor. what type of rock is coquina?
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Which of the following does not describe a physical property of iron? a iron is silvery-white or gray in color. b iron has a boiling point of about 3,000°c. c iron is a magnetic element . d iron and sulfur react to form iron sulfide.
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What do mucus, saliva, and tears have in common? a. they contain chemicals that attack pathogens b...
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