So we're all know that Marcy is a thousand years old vampire - former half human and Mushroom war only happened when she was a little girl (less than 10 years old, i think) but there is another human whose name's Finn is just only 14...So why in the present ( which is after Mushroom war 1k years), there is one human left in the land of Ooo(who is Finn) and he is just only 14? There are at least 2 explainations for that:

1.The humans didnt really "get killed" all in the Mushroom war and some of them didnt get mutated after the war, they still re-created pure human generations until about 12 years ago (when Finn was only a baby in Memory of Boom Boom Moutain), something killed them (including Finn's parents) and that thing is mainly responsible for rareness of human in the land of Ooo today.

2. Most of the humans (including Finn's parents) were killed and all the surviviors of Mushroom war got mutated except Finn cause he had been frozen in time or sort of things like that until Jake's parents found him.

And that doesnt count the possibility that Finn had been adopted before Jake's parents found him or Finn's parents arent "dead" as most of us think.

But in my opinion, the first one is probably more true than the second one

So in my conclusions, the Mushroom war may not be the biggest mystery of adv time at all, Finn's parents might not get killed in the Mushroom war, humans might just only be killed about 12 years ago - not so far .The war could only cause the human's almost extiction at that time but not 12 years ago... But if its not the mushroom did it than what?Who?Another harder question... My head is messed up now XD

What about u guys? DO U GUYS HAVE ANY THEORY, EXPLAINATION FOR THE RARENESS OF HUMAN IN THE LAND OF Ooo?