Question

which of the following populations will most likely be stable over time?
a population with an approximately equal number of individuals who are elderly and people who are of pre-reproductive and reproductive age
a population with a greater percentage of elderly individuals than those of pre-reproductive and reproductive age
a population with a greater percentage of individuals who are at pre-reproductive or reproductive age than the elderly
a population that is subject to constant warfare

Explanation:

A stable population has a balanced age structure, with roughly equal proportions of pre-reproductive, reproductive, and elderly individuals. This ensures consistent replacement of aging individuals with new births. A population with more elderly will decline; one with more young will grow; constant warfare causes unstable, declining population numbers.

Answer:

A. A population with an approximately equal number of individuals who are elderly and people who are of pre-reproductive and reproductive age