Explain how,'Two areas of study namely $evolution$ and $classification$ are interlinked'. Justify this statement.

(N/A) $(i)$ When different forms of organisms are studied,it reflects that life has evolved during the course of evolution,and classification deals with grouping these organisms into groups and subgroups based on their similarities and differences.
$(ii)$ The more characteristics any two species have in common,the more closely they are related. This suggests that they will have a more recent ancestor (and vice-versa).
$(iii)$ Classification helps in tracing the evolutionary relationships between organisms.
Justification: Some groups of organisms have ancient body designs that have not changed much,whereas other groups have acquired their particular body designs relatively recently. Those in the first group are referred to as $primitive$,while those in the second group are $advanced$ organisms. Therefore,complexity in design increases over evolutionary time. Older organisms are simpler,while younger organisms are more complex. For example,the $forearm$ of a human and the $foreleg$ of a horse are $homologous$ structures; they share a common ancestral origin and fundamental plan,even though they perform different functions.