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Our four blood types--O, A, B, and AB, do not appear in all people at the same time, but are the result of evolution and people settling in different climates. In Cold Times, with little to eat on the plains, nomadic tribes had to adapt to the new terrain and the new food it could provide. As a result of the new diet, there will be changes in the digestive and immune systems, followed by changes in blood types.
The difference among four blood types
Type O blood has the longest history. It appeared between 60,000 and 40,000 BC, when the Neanderthal ate a simple diet of weeds, insects, and fruit left over by beasts that fell from trees. And 40,000 years ago, the cro-magnon people, they hunted for a living. After hunting down all the big beasts, they moved from Africa to Europe and Asia.
Type A blood appeared between 25,000 and 15,000 BC. At that time, our fruit-eating ancestors gradually turned to omnivores. Over time, farming became the dominant practice for people living in what is now mode of production, and the domestication of wild animals and game led to changes in the Diet of people. Even now, the vast majority of people with type A blood live in western Europe and Japan.
Type B blood appeared between about 15,000 BC and the new era. Some people in East Africa were forced to migrate from the Savanna to the cold and barren Himalayas. Climate Change has become a major factor in the production of type B blood. The blood type first appeared in Mongolians, who later migrated to the continent, as a result of which many eastern Europeans today have the same type.
The last of the body’s four blood types, AB, has been around for less than 1,000 years, a mixture of indo-european “carrying” type a blood and Mongolian “carrying” type B blood. PEOPLE WITH AB blood type inherit disease resistance, and their immune systems are more resistant to bacteria, but they are more susceptible to malignant tumors.
There will be a fifth blood type soon. It’s entirely possible to have a new blood type, say, type C. Only people with this new blood type can survive in an over-populated, heavily polluted world with few natural resources, because then the original four blood types, that is, billions or even ten billion people will be vulnerable to this growing ecological catastrophe, and they will soon disappear.
protocol to test ABO blood type
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Brief view：
Order of appearance: O → A → B → AB → C ?
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