According to the Neo-Darwinian theory, which of the following is responsible for the origin of new species?
Mutations
Useful variations
Mutation together with natural selection
Hybridization
Which one of the following gas was not present in free form at the time life originated on earth?
The English scientist who worked on the origin of life and settled in India?
Which one of the following experiments suggests that simplest living organisms could not have originated spointaneously from non-living matter