WHY DOES THE BLOOD GROUP VARY FROM PERSON TO PERSON?

BLOOD GROUP - Even though the blood of all the human beings looks alike, in reality, it is not so. Our blood is mainly composed of red blood corpuscles, white blood corpuscles, platelets, and plasma. It has been observed from microscopic investigations that molecules of antigens found on the surface of red blood corpuscles are different in different people. Antigen molecules are a kind of proteins that stimulate the production of...

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WHEN DID THE FIRST ALPHABET APPEAR?

ALPHABET - The origin and development of any language can be traced back to the rudimentary symbols the primitive people used in their verbal interaction. These symbols, when used over a long period, take an established pattern thus giving rise to a new language, But the growth of a language does not stop at oral communication a script for writing is also to be developed. But when did the first alphabet that enabled man to express himself...

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