That would be the consciousness that lives in the meat puppet, the experiences of life shaping it the whole time.
Not a soul, per se, just an accident of physics. Something as yet unquantifiable, but definitely something. Quite possibly something involving quantum physics, which would explain the difficulty in determining what makes us, us.
We’ve discovered that a number of life forms appear to use quantum effects in some way, the ones I remember were navigation oriented (ba dum tish). Having existing examples of biology making use of the quantum world makes the idea much less of a stretch.
Food for thought. 💛
It decays, like the physical body. Entropy comes for everything in the end.