BIRTH RATE - the number of live births per 1000 in a given year
DEATH RATE - the number of deaths per 1000 in agiven year
INFANT MORATLITY RATE- the number of babies who died under 1 per 100 births per year
NATURAL INCREASE - when birth rate exceeds death rate
NATURAL DECREASE - when death rate exceeds birth rate
Global population increased slowly until mid 1900s when it started to grow exponentially due to declining death rates.
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