Concept:A growing population usually has a high birth rate, which raises the number of children and young people.
Explanation:Population growth depends on births, deaths, and migration.
When birth rates are high, more children survive and join the population.
This increases the share of young people in the total population.
Old people do not cause population growth.
A growing population usually has a higher dependent population, not a lower one.
Life expectancy may rise, not fall, when conditions improve.
Answer:A. increase in the number of young people