Can't use Ctrl+J

Hey y’all, first time in here.
I’m trying to do a skull but in the process I separated the mandible from the top part, I’ve tried to Ctrl+J it but it says that there’s “no mesh data to join”.
I have done too many changes to just do Ctrl+Z to try and fix it, I searched for help on the internet but found nothing that matched my problem.
I think the answer to this will be obvious and simple but I’m relatively new to Blender so I’m kinda dumb.

You need to select both parts and then do Ctrl J.

OH GOD I AM SO STUPID
Thanks a lot man

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