Multiple choice general knowledge science & technology Exhaled air has what % of its oxygen left? 77% 26% 48% None Reveal answer Fill a bubble to check yourself D Correct answer Explanation Exhaled air typically contains 15-19% oxygen, compared to 21% in inhaled air. This means roughly 75-90% of the original oxygen remains. Options A (77%), B (26%), and C (48%) are all incorrect values.