Biology is a bad example when applied to a government.

Almost all change in biology happens to populations, not individuals. In order for that to apply to governments, we would need to have massive churn and rapid experimentation of government policies and structures. These are not conducive to voter feedback (eg. Democracy) and would be so disruptive to business and life as to make governments useless until they reached some steady state.

I remember hearing that Italy had 52 governments in 50 years. It’s suffering from all of the same problems as the rest of western countries, perhaps somewhat worse than average.