Look at the age-structure pyramids. the numbers between the bars (in the middle of the graphs) serve as the y-axis. what do these numbers represent? a) the age classes, in 5-year ranges b) the number of people born in a particular year c) the total population, in millions the population of males and females d) the percentage of the population in each age class.

A) The age classes, in 5-year ranges

Explanation:

The number between the bars are the age classes, and the bars represent the populartion, in millions, belonging to the corresponding age class.

A population pyramid like the one attached below usually does not show the number of people born in a particular year. However, this information can be estimated by looking at the year the population pyramid was elaborated, and substracting from that year the corresponding ages illustrated in the pyramid.

answer; /// (culture);

a factory opens that mass-produces light bulbs.

explanation:

not sure if that's an answer to your questions but this is an example! : )