Biology

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

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How many inches in length is the typical human esophagus?
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What system helps animals exchange carbon dioxide and oxygen?
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Which of these is a way dogs communicate with each other?
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What is a group of food chains that are related in some way called?
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What kind of stem would an oak tree have?
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What is a period without growth called in a plant?
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Which of the following is not a risk factor for high blood pressure?
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What happens to your skin's blood vessels as you exercise?
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