यदि किसी आयु पिरामिड (Age Pyramid) का आधार चौड़ा है और यह ऊपर की ओर तेजी से संकीर्ण हो रहा है, तो यह क्या दर्शाता है?

Crude birth rate is defined as the number of live births per 1,000 population in:

Many developing countries experience continued population growth despite a decline in fertility rates due to which of the following factors? (a) Increase in life expectancy (b) Increase in infant mortality rate (c) Falling death rate (d) Better living conditions