different between lifespan vs stylesheetcss

English

life +? span

lifespan (plural lifespans)

The length of time for which an organism lives.
Some clams have lifespans far longer than those of human beings.
(by extension) The length of time for which something exists or is current or valid.
- 2002, Luis M Camarinha-Matos, Collaborative business ecosystems and virtual enterprises
  The virtual enterprise forum developed several "classical" management functions for which resources were available throughout its lifespan.

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