What are the three types of the survivorship curve?

Type I: Type I survivorship curves are characterized by high survival in early and middle life, followed a rapid decline in survivorship in later life.

Type II: Type II curves are an intermediate between Type I and III, where roughly constant mortality rate is experienced regardless of age.

Type III: In Type III curves, the greatest mortality is experienced early on in life, with relatively low rates of death for those surviving this bottleneck.