Ratio of birth and death rates according to $1991$ census is
$29:12$
$33:14$
$36:15$
$37:9$
(b) Ratio of birth and death rates according to $1991$ census is $33:14$ and according to $2001$ census is $26:8$.
The total national income is divided by the total population of the country, then it is known as
The bio-index number means
Which of the following $STDs$ is not caused by a bacterium?
Amniocentesis is a process to
Human population after $17$th century $A.D.$ is thought to be in
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