Both $(a)$ and $(b).$

Palaeontological evidences (Evidences from fossil records)

Study of fossils is called Palaeontology

Leonardo de Vinci $(1452-1519)$ an italian painter and invertor is called the Father of Palaeontology

Fossils are the remains of hard parts of life-forms found in rocks. Rocks forms sediments and a cross-section of earth's crust indicates the arrangement of sediments one over the other during the long history of earth

A variety of fossils ranging from the modern organisms to extint organisms can be observed and depicted by evolution

By studing the different sedimentary layers, the geological time period in which the organisms existed can be predicted