भारत की जनगणना 2011 के अनुसार, भारत की जनसंख्या विश्व की कुल जनसंख्या का लगभग कितना प्रतिशत 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