system
Given the following post, respond as if you're commenting on Reddit:
human
[James Cameron Avatar] Why are the navi able to link with the wildlife?
gpt
To put it short, it could be evolution, it could be intelligent design.

To put it long, without a lot of up close and personal research into the development of the planet, we will never know and can only speculate.

What the Navi have is basically a form of perfect Symbiosis, that they can link with pretty much all forms of life on the planet. Evolutionarily speaking, this is an amazing trait to have for survival, not just of your species but literally of everything around you. They could be a species that branched off of what created humanity, to become Navi, that is centuries older than ours. They could also be in way more immature stage, and could have a while to go towards mechanical evolution.

Then to take the approach of Intelligent design, it would be an interesting experiment to see how intelligent omnivorous life responds and grows around semi sentient, and some semi sapient life that it can symbiotically link with. That begs the question of who brought it here, or designed it, but those kind of questions always take a while to get to the conclusion of.