I was going to say that I have an awesome book about this stuff, and then I saw the author of the post is the author of that book. The book is called "Your Inner Fish" and it is EXCELLENT.
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Our inner ears used to be part of the more complex jaws of something before us, if I remember correctly. I think there’s an arrow on the image showing it. Real cool.
I started out as a fish, how did it end up like this?
We must go back
We must return to the ocean.
Accept the crab form, embrace it and all the limbs we shall gain.
This is something that gets examined pretty well in Your Inner Fish, particularly in the chapter named Your Inner Shark. It analyzes how the embryo develops and how the embryos are very similar to start.
Check out the username of the original post
Kind of a shame that our fish ancestors didn't have more gills. I wonder what we're missing. I mean, we're obviously missing something, right?
Why is the shark embryo adorable and ours is not?
Because we are ugly, mutant fish.
They're a lot more similar irl than you'd expect.
that turtle one is cool