Which of the following is the main reason that makes Bar-Headed Geese unusual among birds?

Question

Quizplus · Accepted Answer

Bar-Headed Geese are unusual among birds because they often fly just above 7000 m, where the air contains only 40% of the oxygen. This altitude is much higher than the normal flying altitude of birds and presents a challenge due to the thin air and low oxygen levels. The Bar-Headed Geese have adapted physiologically and behaviorally to cope with these conditions, making them remarkable birds.

Which of the Following Is the Main Reason That Makes