It’s a shame the author of this picture didn’t check his grammar. I’m always annoyed by the misuse of “its” and “it’s.” Nevertheless, this is a great illustration of the principles of micro- and macro-evolution. As you can see, there is no clear dividing line between any of the colors. So it is with life. There was no “first human” in the Biblical sense. Our ape-like ancestors simply became more and more human-like. Today, we can look at ourselves and say, “Yep. Definitely human.” And we can look at the bones of our ancestors and say, “Nope. Definitely not human.” There have been many thousands of intermediate steps, each becoming slightly more human.
It’s nonsensical to ask about the first human, as much as it’s nonsensical to ask where the text becomes red.