innacus's system was based on his judgement of the importance of various similarities among living things. Scientisis have traditionally med similarities in appearance and Mructure to group organism However, this approach has proven problematic What is one way that this approach could be problematic? A) There is no consistent relationship between aructures and relatedness. B) There is always a clear pattern between appearance and relatedness. C) Some groups look different but turn out to not be related. D) Some groups look similar but turn out to be closely related.