A. They take apples daily
B. They work hard
C. Their RBC concentration becomes high due to low oxygen pressure
D. All the above reasons
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C. Their RBC concentration becomes high due to low oxygen pressure Persons living at high altitudes have rossy cheeks because their RBC concentration becomes high due to low oxygen pressure.
C. Their RBC concentration becomes high due to low oxygen pressure
Persons living at high altitudes have rossy cheeks because their RBC concentration becomes high due to low oxygen pressure.
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