Eventually, the environment is not hostile to their existence. Then, the first hierarchies appear as an emergence system, i.e. protons. Hierarchies become stable. Then more complex atoms Then inorganic molecules, organic molecules, etc. Always with decreasing energy.
Evolution is then a sign of complexification Hierarchy is a sign of discontinuous energy gradients.
All interactions take place within strata. Between the strata, there is nothing observable. In atomic physics, have Shroedinger principles, and Pauli exclusion rules, but then don't see chemical properties. Natural system evolves from the bottom-up. Several types of patterns exist.