In vasectomy, a small part of the .................. is removed through a small incision on the scrotum.
Vasa efferentia
Epididymis
Urinogenital duct
Vas deferens
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?
Higher human population in cities is mainly due to
Human population growth graph is