Biology

Where are red blood cells made?

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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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What are squirrels thought to bury to store for a winter supply of food?
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Which does a mycologist study?
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What are chitterlings?
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What was the dominant invertebrate of Mesozoic seas?
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What is the name of the largest shark?
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How many stages of sleep are there?
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Which of these habitats supports a greater variety of organisms?
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