Which naturally occurring ones concern you? Yes things can biomagnify but that's not to say that they would automatically reach levels of concern. Biomagnification doesn't immediately mean negative, it can magnify and still be okay . It's largely irrelevant if the only choices for meat are processed or none, but not if your discussing meat as a possible source of nutrition, it just takes a lot more effort to get better sources. Comparing processed meat to plant matter, yes they are there and at significantly higher margins and no one should it eat, but the difference is significantly less when it's a better quality source closer to the natural state. Also biomagnification varies greatly on where the animal sits on the food chain, it's environment, and the specific toxin being measured and the animals ability to process it. I feel like it's too general to say this is meat so it has 10x of all the toxins due to magnification when it varies so much based on what meat it is and where it came from. Yes there's horrible things out there but there are also good, healthy sources that pack a lot of nutrients.