Biology
What is made by white blood cells to help fight off infection?
More Questions from Biology
In what season do the leaves of some trees turn colors and start falling to the ground?
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What organ filters blood and helps regulate salt and water levels?
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Who devised a simple test to determine the health of newborns?
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Which of these characteristics allows an owl to see well at night?
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What bird became extinct when settlers came to the island and let loose rats, which killed the birds?
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