First off, you have shown a complete disregard for scientific inferencing with regards to unobservables, so if we applied your rule consistently we would wipe out a very large percentage of science.

Second, a great deal of scientific achievements owe their success to an evolutionary framework.

Here is a pretty good white paper on the subject:

http://www.rci.rutgers.edu/~ecolevol/fulldoc.html

This is a less technical website that you might want to learn and understand (in other words, remember that you are 16 and just a kid learning the new world of science):

http://evonet.sdsc.edu/evoscisociety/short/biologys1.htm

Harv