5th box -Flashcards

Multiple choice questions

Question:

1. Obscure

/əbˈskjʊə $ -ˈskjʊr/ (v.) to make difficult to see When the stars are obscured by clouds, nocturnal migrants may become confused and return to land or stray off course.
/ˈɒptəməl $ ˈɑːp-/ (Adj.) best, most favorable This form of migration allows birds to breed in areas that provide optimal conditions for nesting and feeding their young.
/nɒkˈtɜːnl $ nɑːkˈtɜːr-/ (Adj.) active at night Nocturnal migrants, those species that travel at night, seem to take their navigational cues from the stars.
/ɪmˈperətɪv/ (n.) a priority; an urgent need Migration is an excellent example of how nature has responded to the biological imperative for species to evolve and spread out

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