Which of the following viruses is not transferred through semen of an infected male?
Chikungunya virus
Ebola virus
Hepatitis $B$ virus
Human immunodeficiency virus
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
What percentage of the world population lives in India
Distribution of population on earth is
Accumulation of national resources and saving is known as