Biology

What gives red blood cells their color?

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Which animal was mistaken for the source of the bubonic plague?
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What is another name for the immune system?
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Which of these does a wolf communicate through?
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What are the claws of a bird of prey called?
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What protein is found in the hair and nails of mammals?
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Which of these animals below is extinct?
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What does the zygote form once it starts mitosis?
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Which mammals use a pouch to continue their offspring's development once born?
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