The number of deaths of children from poisoning has declined from about 450 per year in the 1960s to about 50 each year in the 1990s.
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Death Rate is the actual rate of death where Crude Death Rate is a guess on the death rate.
mortality rate - death rate
Crude birth rate is how many live children are born. Crude death rate is how many people die. Crude death minus crude birth is the net gain (or loss) and is called the birth rate. It represents whether or not deceased people are "replaced".
The population of the world is growing very fast and there are different factors which are responsible for this. The highest increase has been seen in Asia as compare to the other continents. In some states, the population growth rate is minus. The major reason of increasing population is the increase in the birth rate and decrease in the death rate. The increasing birth rate is because of the illiteracy and unawareness among the people. People in South Asia also consider their kids as the future earners therefore, more children strategy is being followed by people in rural areas. Death rate has declined because of the medical facilities. Therefore, I think that increasing birth rate and declining death rate are two major factors which are increasing world's population.