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Population Change- Online Notes for Class 8 Social science The world’s population grew at a slow and steady pace till the 1800s. The birth rate and death rate were terribly high throughout this era. There were no correct health facilities. attributable to agricultural production was low and therefore food convenience was a drag. The world’s population reached one billion in 1804. among one hundred fifty years at the moment, the world’s population reached three billion in 1959. Death rate reduced and birth rate remained fairly high throughout this era. Birth Rate: the amount of live births per one,000 individuals is termed birth rate. Death Rate: the amount of deaths per one,000 individuals is termed death rate. When the death rate is quite the birth rate, it'll result in de-growth in population. there'll be no growth in population if the birth rate is up to the death rate. The growth in population, If the birth rate is more than death rate.