Perhaps the adjective “biological” is tripping you up.
All of the breeds commonly labeled as “pitbulls” are all members of the species canis familiaris. It should therefore be easy to produce evidence that any of the breeds referred to as “pitbulls” have an inherent biological ability to lock their jaws.
No doubt, you will have biological evidence forthcoming in your next post.
Yawn..... I’ve had many different breeds of dogs( granted, none anywhere near as ugly as pit bulls, but some smaller, some larger, NONE had jaws that could lock on and hold onto that tire for 10 minutes without letting go. Don’t play stupid, you know that pits and some breeds have more jaw crushing power than others and they are inclined to use it. Statistics don’t lie and no, I am not going to spend my Sunday posting all of the stats. You have fingers, search for them. But I suspect you already know. What is your skin in this game? Pit owner most likely.
Funny how pits are the most common dog in pounds across the US. Wonder why.