system
Given the following post, respond as if you're commenting on Reddit:
human
How accurate is "The Origin of Species" by Charles Darwin?

I'm just wondering if it still fits with our modern understanding of what evolution is. What did he get wrong? What did he get right? etc. 

EDIT: Grammar.
gpt
Well Darwin didn't know about genetics , so he had to guess about a heritability system. He also didn't have all the fossils we have now and mentions that the lack of fossils is a problem. But you could see both of those more as predictions that came true rather than mistakes.