Formation new species from pre-existing ones is

The phenomenon of development of a new species from pre-existing one is called ul("mutation") .

Assertion (A): Speciation is the process of formation of a new species from a pre-existing one. Reason (R): Mutation plays a role in speciation

Geographic and reproductive isolation are most closely associated with Or The origin of species from pre-existing species is

Formation of new individuals from pre-existing one is called as….

Genetic variation is responsible for formation of new species from earlier ones.