What is a population viability analysis (PVA ... early on that the process of extinction is best viewed as stochastic, meaning a process with random elements and thus not predictable with ...

Fetal viability refers to how soon a fetus can be born and survive outside of its mother's womb. Fetal viability is typically set at 23 weeks of gestation but varies depending on certain factors.

They are presented here as a framework to evaluate the dilemma of resuscitating infants at the limits of viability. These four principles are considered "prima facie," meaning the principle is ...