A) Curve II shows a population in which rate of mortality as a proportion of survivors is constant. This could characterize some animals, such as birds, that care for their young and so avoid high rates of infant mortality. However, they have other sources of mortality than old age, such as predation or lack of food, which will kill at any age. B) Curve I shows a population with low infant mortality rates, and where most members live to an old age. This could be a human population, which has the resources to support expanding population size and prevent infant deaths. C) Curve III shows a population in which the very young have heavy mortality rate, but survivors live to an old age. This could represent species of vertebrates such as fish, which produce great numbers of offspring, most of which die before reaching adulthood.
Work Step by Step
A)Curve II B)Curve I C)Curve III