The correct option is C Genetics
The branch of biology that deals with the study of heredity and variation are called Genetics. Palaeontology is the branch of biology which deals with fossils of animals and plants that lived up to billions of years ago. Evolution is the change in the characteristic of living organisms over a generation. Ecology is the branch of biology which deals with the interaction between non-living and living components in the environment. Thus, the correct answer is C.