As I use sandpaper on some rusty metal, the sandpaper gets hot because: a. heat is flowing from the sandpaper into the metal. b. heat is flowing from the metal into the sandpaper. c. frictional processes increase the internal energy of the sandpaper. d. heat is flowing from my hand into the sandpaper.

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Human Metabolism

Being described as the most complicated machine ever encountered by humans, the human body and the cell metabolism is nothing less than a wonder. Metabolism is the set of life-sustaining chemical reactions within organisms.