As to your thesis, there are not infinite levels of “life” below us, right? At some point, the mechanisms at play are purely chemical interactions.

I do not believe that are are infinite levels of "life" below us or above, but I do believe there are infinite levels of consciousness. But my definition of consciousness is not restricted to life. I do not equate consciousness with “intelligence” or life. I think consciousness is a fundamental property of every little thing in our universe. I believe that higher levels of consciousness arise due to higher levels of systemic complexity. This definition is more intuitive to me as compared to the modern definition where conscious life develops on earth from essentially nothing that is itself “alive”.

As an aside, I don’t know that I’d place the subconscious below consciousness in the foundational way you built. I have wondered whether what we’ve thought of as the subconcious is merely the manifestation of right hemisphere expressing itself

This is a fascinating idea! Thank you for sharing and I'll be sure to read more about this.

An interesting point is that no level below consciousness does science. No organ (besides the brain), no cell, no DNA strand, ponders the the question you pose.

I would argue that all levels below us do science, at our meta level we simply have ability to observe and describe the science that they do. Sure our cells almost definitely do not have the capacity ponder the question that I raised. But how do you know they don't have other ways to express their agency? A renown biologist Michael Levin took some basic skin cells from a frog embryo and separated them from the rest of the organism. Astonishingly these "skin" cells rebooted themselves and converted into a new type of organism that is able to solve simple mazes, and demonstrate individual and group behaviors. Source: https://youtu.be/p3lsYlod5OU?si=t2-mBbwNWTSX2Lp8&t=389