(i) (a) Different forms of organisms/ life have evolved during the course of evolution, and classification deals with grouping of these organisms into groups and subgroup based on their similarities and differences.
(b) The more characteristics any two species have in common more closely they are related/ well have a more recent ancestor (and vice versa).
(c) Thus classification helps tracing the evolutionary relationships between the two organisms. Hence classification and evolution are interlinked.
(ii) (a) If we dig into the earth and start finding fossils, it can be assumed that the fossils closer to the surface are more recent to those found in the deeper layers.
(b) By detecting the ratios of different isotopes of the same element in the fossil material.
