The name of the scientist who first peeped into a mosquito's stomach and proved that mosquitoes spread malaria and for his research was awarded Nobel Prize in medicine in December 1902 is:

Select the correct statements about an elephant herd.

I. An elephant herd has mainly females and baby elephants up to 14-15 years old.

II. An elephant herd comprises members of a particular family.

III. The oldest female is the leader of the herd.

IV. An elephant herd may accommodate any number of female elephants and the young.