This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Males have more levels of testosterone thus producing more RBC's and they have more energy consumption further more they have high metabolism rate and power.....thus these requirements require more oxygen for normal function so as a result males have more RBC's as compared to females.