Is evolution a theory that has a little scientific support?

A scientific theory, in order to be accepted by scientists must fits the facts as we know them, and be capable of predicting results not yet known. There should not be another, conflicting theory that better fits the known facts. The Theory of Evolution meets these requirements - it fits the facts as we know them, subsequent research results are consistent with the Theory of Evolution, and there is no other theory that better fits the facts known to science. The principal driver of evolution is known to be natural selection, but other, more specific drivers include sexual selection and so on. Just as natural selection results in the survival of the fittest, sexual selection results in attractive individuals being more likely to pass on their genes to the maximum number of offspring. Natural selection and sexual selection are both complementary and at odds. For example, if a male bird with an attractive, longer tail is less likely to escape its predators, then it may not have many offspring.