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Your statement of "Evolution is only a theory" is a testament to the views of what exactly a "scientific theory" truly is.  A scientific theory is, in short, as close to proven as one can possibly get within the realm of science.  For instance, Gravity is only a Theory in science. Infact, there is far more evidence supporting the Theory of Evolution than any Theory of Gravity(As stated before-Theory must make valid, repeatable, and consistent predictions, and Gravity gets tricky at times).  What do I mean by this?  Theories are based on varifiable, testable, and repeatable experiments, with consistent, reliable, and predictable results. The Theory of Evolution,infact, falls under all of these criteria.  In basic terms, this is the ACTUAL Theory of Evolution(Not what you may be told it is, or what people may believe it to be, but what it actually states, in layman's terms):

Your statement of "Evolution is only a theory" is a testament to the views of what exactly a "scientific theory" truly is.  A scientific theory is, in short, as close to proven as one can possibly get within the realm of science.  For instance, Gravity is only a Theory in science. Infact, there is far more evidence supporting the Theory of Evolution than any Theory of Gravity(As stated before-Theory must make valid, repeatable, and consistent predictions, and Gravity gets tricky at times).  What do I mean by this?  Theories are based on varifiable, testable, and repeatable experiments, with consistent, reliable, and predictable results. The Theory of Evolution,infact, falls under all of these criteria.  In basic terms, this is the ACTUAL Theory of Evolution(Not what you may be told it is, or what people may believe it to be, but what it actually states, in layman's terms):

Individuals within a population whose traits are more desirable for a certain environment have a higher chance of reproduction than those without that trait.

Individuals within a population whose traits are more desirable for a certain environment have a higher chance of reproduction than those without that trait, and thus there is a higher degree of probability that trait will be passed on.

That is a basic summary of what the Theory of Evolution states(There is more to it, really, however that is the very basic sense).  And all tests have proven that Evolution is indeed a valid theory. We then move on to use the Theory of Evolution, along with fossil records, strata, and the biological processes to construct a possible path of evolution(Which, incidentally, is not the Theory of Evolution-just a model based upon it).

That is a basic summary of what the Theory of Evolution states(There is more to it, really, however that is the very basic sense).  And all tests have proven that Evolution is indeed a valid theory. We then move on to use the Theory of Evolution, along with fossil records, strata, and the biological processes to construct a possible path of evolution(Which, incidentally, is not the Theory of Evolution-just a model based upon it).