Evolution is all about one species evolving into something completely different.
This is not true. Evolution is merely alelle frequency change over time. While this change can result in and has resulted in a change in species, there is no requirement that speciation occur before it can be stated that evolution has occured.
For you to say that speication leads to evolution is skirting the issue.
I am not making any such statement. The opposite is true: evolution leads -- sometimes -- to speciation.
There is no proof that any species has speciated to complete evolution. Apparently you are unaware of the existence of
observed instances of speciation. There are, in fact,
a number of examples on the subject.
The melatonin that I have taken is having an effect, so I will have to return to this discussion tomorrow.