Petri nets can be used for populations dynamics, and indeed the structured cospans approach to Petri net is being used to simulate epidemic diffusion right now:

Petri nets can be used for populations dynamics, and indeed the structured cospans approach to Petri net is being used to simulate epidemic diffusion right now: https://www.algebraicjulia.org/blog/post/2020/10/structured-cospans https://www.algebraicjulia.org/blog/post/2020/10/structured-...