Develop a SRF model to describe the divergence of liverworts from other plant species. Your model should show:
1. Show how populations of multiple phenotypes originate
2. Show how reproductive barriers reduce gene flow between populations
3. Show when stomata originated in ancient plants.

Possible structures (more are likely): liverwort ancestor, liverwort, other plant species, barrier to gene flow, new population, diverging population (don't have to describe evolutionary mechanism)
Possible relationships (more are likely): selection, reproductively isolating mechanism,