Why humans have different blood group?

More Questions

• What is the most common blood group in humans?
• Why is blood group o called universal donor?
• What is the ph of human blood?
• What is the importance of blood group?
• What blood group is the universal donor?
• How to change blood group in driving licence online?
• What is the blood group of jesus?
• Why blood group o is called universal donor?
• Why human blood is red?
• What happens if husband and wife have same blood group?