Study the three different pictures of population pyramid given below and answer the following question. (Q 5)

Pyramid marked as 'A' represent which of the following?

Expanding population

Expanding Populations: The age-sex pyramid of Nigeria is a triangular shaped pyramid with a wide base and is typical of less developed countries. These have larger populations in lower age groups due to high birth rates. The pyramids for Bangladesh and Mexico, would also look the same.