Biology

What characteristic could show that a bird might be ready to reproduce?

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What are animals that have no backbones called?
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Which nutrient group is used to help grow and repair cells?
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Which of the following is the smallest?
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What are the lungs that tarantulas breathe with called?
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What substance in your ears helps keep germs and dirt out?
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What are squirrels thought to bury to store for a winter supply of food?
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Bacterial infections in humans can be treated with what?
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What does a lionfish have in its spiny fins?
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