Iterations

The American flag has had many iterations, evolving from an unofficial banner into a government-sanctioned version in 1777.

The new strain has rapidly infected many more people than the earlier iterations.

How many more iterations are we going to need?

These models, or "population viability analyses," assess the risk of extinction over time based on computational iterations that play out how a herd may expand and contract (with births and deaths) and genetically evolve given the interplay of the number, age and sex of animals in the herd; reproductive traits; influx of new genetics vs. inbreeding; management actions (culling/hunting); and potential effects of random events such as disease, drought and fire.