निम्नलिखित में से कौन सा आयु वर्ग आमतौर पर एक विस्तारित आयु-लिंग पिरामिड (expanding age-sex pyramid) का आधार बनाता है?

Which of the following statements correctly describes the meaning of the term 'population momentum'?

A triangular-shaped age-sex pyramid with a wide base indicates that:

With reference to the Total Fertility Rate (TFR) in India, consider the following statements: 1. Replacement level fertility is generally considered to be around 2.1 children per woman. 2. The National Family Health Survey (NFHS) provides periodic estimates of TFR for India. 3. A TFR falling below the replacement level automatically leads to an immediate decline in the total absolute population. Which of the statements given above is/are correct?