Who are we?

[Human No More]

Technically, individual cells from a larger organism don't count as a lifeform on their own.

If you're talking about a kind of Earth equivalent to Eywa, I'm not so sure. There's no observable/demonstrable connection between organisms.I guess such a relationship could exist on a more subtle level, but it's a lot more abstract than that (and not sentient), just based on living in the same world.
It would be a nice idea, but Devourment is right.