The above graph shows the world population in the last twelve thousand years. The sharp dip caused shortly after 1000 A.D. is due to a deadly disease called ___ .

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Solution

The sharp dip shortly after 1000 A.D. is due to Black Death. The Black Death was one of the most destructive diseases in human history, resulting in the deaths of an estimated 75 to 200 million people and peaking in Europe in the years 1346–53. It was an epidemic plague which is caused by a bacterium (Yersinia pestis) transmitted to humans from infected rats by the oriental rat flea.

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The sharp dip shortly after 1000 A.D. is due to __.

Age group (in years)	$1 - 14$	$15 - 29$	$30 - 44$	$45 - 59$	$60 - 74$	$75$ and above
Number of persons	$2$ lakhs	$1 l a k h 60 t h o u s a n d s$	$1\ lakh\ 20\ thousands	$1\ lakh\ 20\ thousands	$80 t h o u s a n d s$	$40 t h o u s a n d s$

1

= 20 t h o u s a n d s)

60

Name some deadly diseases caused by viruses.

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