O.K., remember I was toddling along with evidence. I would greatly appreciate it if people, especially people who deny that this evidence exists, would respond to it in some way, instead of dragging in extraneous lies from creationist websites, because it distracts us from the task at hand, which is evaluating this evidence. After all, if you're going to deny it exists, don't you need to look at it?
Now we turn to a huge piece of evidence which unfortunately is bit technical and harder to understand, DNA.
It's hard to remember how long ago Darwin figured evolution out, and how little was known about the world. There was no modern genetics, no understanding at all of this subject. Darwin never read Mendel, whose work was ignored for decades. So Darwin had no idea how inheritance worked. He had no concept of how a trait was passed from one generation to the next.
But he knew that, for his theory to be true, there must be some such mechanism. There must be some physical thing in our bodies that can convey from a parent generation to a child generation instructions for reproducing itself. It also must be able to mix traits from male and female parents, and it must also occasionally make "errors," that is, random changes in these instructions. He had no idea what it would look like, only that it must exist.
More than this, ToE* predicts that whatever this mechanism is, it must be the same for all living things. Wow, that's a big, gutsy prediction. Why must it be the same? Because ToE says that all living things descended from a single common ancestor. So this core trait, the mechanism of reproduction, would have to be the same, whether for yeast, slugs, daffodils or whales. If we did not find such a trait, ToE would be falsified.**
Decades after Darwin made this bold prediction, it was verified, with the discovery of DNA. DNA does all the things that ToE predicts, and, amazingly, every living creature reproduces by DNA. From E. coli to an African Elephant--to you--DNA. By meosis and mitosis, it mixes up the traits of both parents. And it exhibits random mutations. Which, contrary to the lies you've read on creationist website, can be neutral, harmful, or beneficial. These mutations generate the random changes that are the creative material from which natural selection culls.
It also turns out that DNA will confirm, predict, and explain many things about ToE, many of which I've been explaining, but that gets too long for one post, so later on that.