Look at the hierarchy in Can you recall the basis of arrangement? Say, for example, as we go higher from species to kingdom, the number of common characteristics goes on decreasing. Lower the taxa, more are the characteristics that the members within the taxon share. Higher the category, greater is the difficulty of determining the relationship to other taxa at the same level. Hence, the problem of classification becomes more complex.
Assertion (A): Taxonomic relationships become more difficult to determine at higher categorical levels. Reason (R): Higher taxonomic categories have more shared characteristics among their members than lower categories.
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