So what does this mean ''One of the important things that will need to be found to prove evolution is, two living creatures that are almost exactly the same, one of which has a mutation within it, to make it slightly better than the other one'' ?
English is a difficult language at times. It's strange that you would ask me, of all people, what some English means.
Let's start with, ''One of the important things ..." This has several parts, depending on where you focus your line of thought for the moment. Lets focus on "One" first.
One of the important things... means that this is only one of more than one. Next, lets focus on "important."
One of the
important things ... means that, as the dictionary definition of the word "important" says -
https://www.dictionary.com/browse/important?s=t - "1. of much or great significance or consequence." Simply click the dictionary link to check out other meanings for this word. Not that "important" is modifying "things." Now let's check out the word "thing."
One of the important
things ... means "1. a material object without life or consciousness; an inanimate object" -
https://www.dictionary.com/browse/things?s=t. You can click the link to check out other aspects of this meaning. Now let's see if we can get a sense for the words "of the."
One
of the important things ... shows the relationship of "One" to "important things." "Important things" is plural. "Of the" shows the relations ship of the word before "of the" (one) to the words "important things" (plural)... in this case the number of important things being talked about.
Since that number is only one, and since the "important things" is plural, that means that there must be other important things, right? So, we have "One of the important things ..." shown in the rest of the part of the wording you supplied us with, but didn't seem to understand, yourself.
With regard to the evolution story, some of the other important things are found in my writing directly above, at
https://bitcointalk.org/index.php?topic=1917510.msg44130813#msg44130813:
You forget that simply showing that these things exist isn't proving that they are evolution, especially evolution theory evolution. We haven't gotten deeply enough into the "programming" of the various forms of cause and effect using the various forms of physics that exist. The whole thing is very complex, and we simply don't know if we have discovered it all, so that we can make a correct judgment.
If you want to see the truth a little bit at least, you really need to slow down and absorb what is being said a little. You're a big enough boy that you can wipe your own nose. You don't always need a nursemaid to explain everything for you.
No proof for evolution as a fact.
Evolution is a hoax.

''Researchers at the U.S. Department of Energy's Lawrence Berkeley National Laboratory have discovered the mechanism by which an extremely rare protein mutation shields people from cardiovascular disease''
Pack it up boys, we proved evolution to badecker! At least ''one important thing'' that he thought didn't exist. We won!