How are human remains “unidentifiable”?

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I feel like this is stupid question and I just can’t brain today but here goes…

This came about while I was reading about 9/11 earlier (am not American) but I’m now questioning a lot of things. Anyway, I read there’s still something like 1,000 human remains yet to be identified from that day; so how does that work in any case? If we know who is unaccounted for and there are bodies, why can’t they be matched up?

In: Biology