One of the earliest atomic models was suggested by john dalton in the early 1800s

John Dalton was an English Chemist (1766 - 1844) who focused on the model of the atom. Dalton proved that matter is made up of tiny particles, called atoms, and that the atoms cannot be divided into smaller pieces and cannot be destroyed. Other thing that Dalton proves was that atoms from the same element are same and that different element can be combined and form compounds.

I’m not exactly sure what your trying to ask, but if it’s how an organelle is similar to a body system or a part a nucleus is like a in function. but i don’t fully understand what you’re trying to ask