Which of the following is hormone releasing $IUD$?
$Cu-T$
$LNG-20$
$Multiload \;375$
Implant
$LNG-20$ is a levonorgestrel $IUD$
Average population density on earth is
$ZIFT$ stands for
The animal population becomes too large for its feeding source or its habitat, its members starve die but humans escape this disaster by
According to $1991$ census, the number of females per $1000$ males is
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