Concept:The shape of an age-sex pyramid reveals a country's population dynamics, with different shapes indicating expanding, stable, or declining populations.
Explanation:Statement 1 is correct. A triangular pyramid with a wide base shows many young people due to high birth rates, common in less developed countries like Nigeria.
Statement 2 is correct. A bell-shaped pyramid with a tapered top means birth and death rates are nearly equal, resulting in a stable population, as seen in Australia.
Statement 3 is correct. A narrow base and tapered top indicate low birth and death rates, often found in developed countries like Japan, with zero or negative growth.
Answer:D. 1, 2 and 3
