Question

why man is called as moving museum

Answer 1

Inside our human body, there are many organs and systems that perform various actions for our survival. But still many don't know completely about our inside body. It's a vast subject! 
Thus, man is called a moving museum as there are still wonders to be explored and view within us. And it's a wonder that it makes up a great museum indeed a moving one. 
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Answer 2

As a measum consist up of many things about which we are not know as same our body consists up of many organ essential forour selves about which we are not known