Question

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Why humans have different kinds of blood groups?



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Answer 1

There is an evolutionary reason for having more than one blood type, and humans aren't the only species with such a trait. Our distant ancestors used to, but then mutations created different antigens on the outside of red blood cells, leading to the different blood groups.

Human blood types most likely came to exist to fend off infectious diseases. The incompatibility of some blood types, however, is just an accident of evolution. Blood type A is the most ancient, and it existed before the human species evolved from its hominid ancestors.

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Answer 2

Answer:

As light from a star races through our atmosphere, it bounces and bumps through the different layers, bending the light before you see it. Since the hot and cold layers of air keep moving, the bending of the light changes too, which causes the star's appearance to wobble or twinkle.