but I definitely think that some kind of CNS is required for the experience of emotions like fear, happiness etc.

okay, so when a scallop runs away from you it doesn’t feel fear?
and when a paramecium is being ensnared by a hydra or some weird protist on your microscope slide, and it’s struggling to get away, it doesn’t feel fear? lol

Obviously every moving living thing can feel fear, that’s why they’re moving living things and that’s why they run away from predators

I would also argue that there is no dividing line between life and non-life. Whether something is alive or not is quite nebulous and hard to define

With a few exceptions like viruses, it’s pretty obvious. Rocks don’t make more rocks, nor does water