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 population of males and females
b. the age classes, in 5-year ranges
c. the total population, in millions
d. the number of people born in a particular year
e. the percentage of the population in each age class

The answer is B. the age classes, in 5-year ranges

Explanation:

Age structure pyramid, also called an age-sex- pyramid, is a graphical illustration that shows the distribution of various age groups in a population. It is often viewed as the most effective way to graphically depict the age and distribution of a population.

It contains continuous bars stacked on top of another with each representing an age category, making it a horizontal bar diagram. The horizontal length which is the x-axis represent the number of individuals while the age-groups are represented on the y-axis (vertical or central). The age group are the same size to maintain proportionality.

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

a physical change is being made.