Secondary infertility is

Statement 1: Human population doubles after every $35 \;years$ as against $200\; years$ in $1600-1800$

Statement $2$: Rapid increase is due to the better health facilities

$MTP$ is considered safe upto how many weeks of pregnancy?

The ‘symptomless’ period or latent period in case of syphilis may last for

Oral polio vaccine and hepatitis first dose is given to a child at