Correct Answer: Palaeontology

Solution : The correct option is Palaeontology .

The branch of biology that deals with extinct organisms is called palaeontology. Palaeontology is the scientific study of prehistoric life, including the study of fossils, ancient organisms and their environments. Palaeontologists use various methods and techniques to reconstruct the biology, ecology, and evolutionary history of extinct species. As fossils are frequently found in sedimentary rocks, which can provide clues about ancient habitats and climates, this field of study also aids in the understanding of geological processes.