Function looks forward and mechanism looks backward?

Function looks forward and mechanism looks backward..... is this a
meaningful sentence ?

Function in biology

http://en.wikipedia.org/wiki/Function_%28biology%29

...A function is the reason some object or process occurred in a
system that evolved through a process of selection or Natural
selection. Thus, function refers forward from the object or process,
along some chain of causation, to the goal or success.[1] Compare this
to the mechanism of the object or process, which looks backward along
some chain of causation, explaining how the feature
occurred...Function is not the same as purpose in the teleological
sense....... Evolution is a blind process which has no 'goal' for the
future.
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Functionality must be explored under the D'Arcy Wentworth Thompson's
Composite Integrity or Irreducible Functionality, the interplay
between complexity, redundancy and functionality representing a
pattern with a purpose or mechanism as interpreted in terms of the
Pattern or design dichotomy

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