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Unit 2: BIRD MIGRATION
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1. Evolve
/ɪˈvɒlv $ ɪˈvɑːlv/ (v.) to develop gradually Scientists believe that birds evolved from dinosaurs.
/streɪ/ (v.) to leave the correct route; become separated from the group When the stars are obscured by clouds, nocturnal migrants may become confused and return to land or stray off course.
/ɪnˈdjʊə $ ɪnˈdʊr/ (v.) to live under difficult conditions … winter season in nearby valleys, enduring some of the coldest conditions on Earth.
/ˈheməsfɪə $ -fɪr/ (n.) one half of the Earth; also, one half of a sphere … migration of this type takes place primarily into the higher latitudes of the Northern Hemisphere.
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