Population density means
The number of human per unit area
The number of human in a unit area at a specific time
The concentration of human population at a place
None of above
$NSEP$ stands for
Average population density on earth is
Syphilis is an infectious bacterial disease caused by Treponema pallidum with $3$ stages
$(A)$ Infectious painless ulcers on the genitals $\quad$$(i)$ First
$(B)$ Blindness, heart trouble,aortic impairment $\quad$$(ii)$ Second
$(C)$ Skin lesions, hairloss,swollen joints $\quad$$(iii)$ Third
Which of the following is the correct match between the symptoms and stage?
Which one of the following is an example of Hormone releasing $IUD$ ?