5th box -Flashcards

/fiːt/ (n.) a difficult act or achievement Modern-day researchers have attempted to understand this feat.

/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

/ˈfjuːəl/ (v.) to provide energy About 55 percent of bird body weight is made up of the fat necessary to fuel this amazing journey.

/ˈwɪndswept/ (Adj.) unprotected from the wind Many rock ptarmigan never leave the high arctic tundra, spending their breeding season atop windswept arctic peak