Population density is the number of people per unit area. It is usually expressed as the number of people per square kilometer (km2) or square mile (mi2). Population density can be used to compare the population of different countries or regions. It can also be used to track changes in population over time.
The percentage of literate population is the percentage of people in a population who can read and write. This is an important indicator of a country’s level of education and development.
The distribution of population across age groups is the way in which the population is divided into different age groups. This information can be used to track changes in the population over time and to plan for future needs, such as education and healthcare.
The male to female ratio is the number of males per 100 females in a population. This information can be used to track changes in the sex ratio over time and to identify potential problems, such as gender inequality.
The correct answer is: The number of people per square kilometer.