There are two opposing views about origin of modern man. According to one view Homo erectus in Asia were the ancestors of modern man. A study of variation of $DNA $ however suggested African origin of modern man. What kind of observation on $DNA$ variation could suggest this

Which of the following cannot be explained by Lamarckism ?

Sympatric speciation is also known as

Bacteriophage transfers $DNA$  from donor to recipient cell, this is called

Ornithorhynchus is a connecting link between