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I see a chin on my cat?
You see a chin area yes, but it is simply the bottom of the jaw. The human chin has actual muscle that goes below the jaw bone and can be moved ever so slightly which aids in facial expression.
https://en.wikipedia.org/wiki/Mentalis?wprov=sfla1
As bigfig said, your cat probably doesn't have a chin. That said, you might consider feeling your cat's chin to see if it's actually a chin and not just fluff or something.
If you feel a boney protrusion similar to a human's chin, then you should unironically contact an evolutionary researcher. They might be fascinated about your cat having an actual chin as humans and only humans (not even neanderthals) are the only known chin-havers. Who knows, your cat might be the "missing link" between chinned and chinless humanoids.
I scratch my cats chin all the time. What are you on about? (Edit: I be wrong. There's no chin there)
https://cdn11.bigcommerce.com/s-8be44/images/stencil/1280x1280/products/2549/4697/CatSkeletalAnatomy__24888.1345374154.jpg?c=2
Jaw vs chin, I'm guessing the difference is fairly small.
Looked at wiki. The chin apparently is just the part of bone that juts out under the lower lip. So yeah, no chin on the cat.