In India, marriageable age for boys is ______ and girls is ______ respectively.
$21, 18 \;years$
$15, 14 \;years$
$15, 18 \;years$
$18, 21 \;years$
Marrying before the respective ages is illegal.
$A$ birth control implant having six small, plastic cylinders and with the effective period much longer upto $5$ years is
Human population after $17$th century $A.D.$ is thought to be in
The animal population becomes too large for its feeding source or its habitat, its members starve die but humans escape this disaster by
A force which acts against the achievement of highest possible level to population growth is known as
According to $1991$ census, the number of females per $1000$ males is
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