When migrating, birds usually migrate when there's not enough food, shorting of daylight, and when it's getting colder in winter. Birds that migrate do so in the late summer through the fall and in the late winter through the spring. Birds and use a radical pair-based compass to "see" the Earth's magnetic field when migrating.
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B. He noticed the musty odor of each page as he carefully turned it over.
Explanation:
Musty is a word that can be used in a sentence which contains the sense of smell
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we need the passage if you want us to answer it
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