AP BIOLOGY

Detailed explanation-1: -In a Type I curve, organisms tend not to die when they are young or middle-aged but, instead, die when they become elderly. Species with Type I curves usually have small numbers of offspring and provide lots of parental care to make sure those offspring survive.

Detailed explanation-2: -Type III or concave curves have the greatest mortality (lowest age-specific survival) early in life, with relatively low rates of death (high probability of survival) for those surviving this bottleneck. This type of curve is characteristic of species that produce a large number of offspring (see r/K selection theory).

Detailed explanation-3: -Organisms that exhibit Type I survivorship curves have the highest probability of surviving every age interval until old age, then the risk of dying increases dramatically. Humans are an example of a species with a Type I survivorship curve. Others include the giant tortoise and most large mammals such as elephants.

Detailed explanation-4: -The survival curve of modern humans is described as a classic “Type-I”, where the probability of survival is high until relative old age, whereby it then declines rapidly, which is typical of many large mammals.