Lets ask Mr. Dictionary shall we?

Circle:-something with a perfectly round circumference

Life:- 1 a history of a person's life <our assignment is to write a short life of an author of our own choosing> 2 a member of the human race <an appalling number of lives were lost in the war> — see 3 active strength of body or mind <even though he's 86 years old, he still shows a lot of life> 4 the period during which something exists, lasts, or is in progress <the Egyptian civilization had an extremely long life> 5 the way people live at a particular time and place <frontier life must have been rugged, exciting, challenging, and not a little dangerous>

there is no definition of "Circle of Life" so this is the best i could do.
notice it never said anything NATURAL.

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