You can even argue in both directions on that really easily. Bacteria exchange useful DNA all the time. When people get an e. Coli infection it's from ingesting a variety different from your native gut flora, if I remember right. The miniature world is a weird place, it's the kind of thing that makes me daydream about that perspective the men in black movies did.
I don't think there's any way of really knowing if we're a bunch of subatomic particles living on an electron.