4. 'The fertility increases the population whereas mortality decreases the population. Describe the statement with examples.

Hey mate! I've taken some notes down that may or may not help ya.

Here:

"Human females are most fertile between teen years and mid-forties.

Human males are usually fertile throughout adulthood, but sperm starts to diminish during middle-age.

The effect of mortality on population structures is to reduce the component of the population in which the mortality occurs. The effect of this is to raise the population in the upper age groups substantially. Women have higher life expectancy than men wherever they live.

The major factors affecting the population are birth, death, and migration. Birth increases the population while death decreases the population. Migration also causes population change. Internal migration does not make any changes but international migration makes the differences in the size of the population.

The rate of natural increase of a population depends on birth and death rates, which are strongly influenced by the population age structure."