Question

age-structure diagrams
age structure diagrams with a wide base compared to a very narrow top indicate very fast growth in that population. why does a wide base and very narrow top on an age structure diagram indicate fast growth in that population?
because there is an equal number of old and young people
because there are fewer young people than older people
because there are many more old people than young people
because there are many more young people than old people

Explanation:

An age - structure diagram with a wide base and a narrow top has a large number of young individuals (the base represents younger age groups) and a small number of old individuals (the top represents older age groups). When there are many young people, as they grow up and reproduce, the population will experience rapid growth. The other options are incorrect: the first option says there is an equal number of old and young, which doesn't match the wide - base - narrow - top shape; the second and third options suggest there are fewer or more old people than young, which is the opposite of what a wide - base - narrow - top diagram shows.

Answer:

D. because there are many more young people than old people