One To(o) Many

We are all acutely aware of our bodies, identify ourselves with our bodies. We think of our body as being one. A body. What if it isn’t?
Evolutionarily speaking, the very first multi-cellular organisms were but a colony of individual cells each of which could very well be ‘a’ body. But living together, they all formed ‘a’ new body, each individual unit performing all the functions every other unit did. However, gradually this group of cells started to speciaize so they did not have to do all the work but just some of the work such that if every unit was perfectly coordinated with the others, they could survive perfectly well and in fact better than if the individual units were by themselves. Thus evolved the complex life forms if we were to accept one of evolution’s most basic tenets.
Taking this a step or more further, we could indeed all be just that, a colony of cells cooperating in a perfectly synchronized way. Think about it. What if this were true? So then who are YOU now?