What is the function of copper $-T$ ?
Checks mutation
Stops fertilization
Stops zygote formation
Stops oblituation of blastocoel
Which of the following cells are infected in a person suffering from $AIDS$?
When the $2 ^{nd}$ and the $3^{rd}$ dose of $DPT$ is given to a child?
Infant mortality rate is minimum in:
The minimum number of females per $1000$ males are found in
‘Essay on population’ was published by