I think I have to disgree with some of the comments about who puts abiogenesis and evolution together and who doesn't.
They are, of course, rather different disciplines; one being chemisty and one being biology.
However, when these subjects are being rushed over in a very few weeks of high school science they sure look like they are together.
It seems to me that you find geology and evolution (because of fossils) being taught within pages of each other in some texts and then a half page somewhere in there on the ideas of origins of living things.
The distinctness of the disciplines doesn't show up when the coverage is so very light.
For this reason I would excuse the average creationist when they come in here confused about it. What I can't excuse is the professional creationists who know better but use it as a red-herring in discussions of the ToE. THAT is dishonest.
And let's remember that if you are studying the evolution of life on earth it is a pretty obvious question to bring up "How did it start? ". Let's be fair about that too.
Darwin set the stage correctly originally. He made it clear he was NOT talking about the orgins of life. He didn't even to commit to just one ancestor to all life. Those issues were not what he was discussing and, as we've pointed out, separate questions to the ones he was answering.