When taxonomists classify organisms using a phylogenetic approach, they are most concerned with

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Taxonomists using a phylogenetic approach are most concerned with derived traits, as they are used to determine evolutionary relationships between organisms. Ancestral traits may be present in multiple lineages and do not provide as much information about relationships between organisms. Cladists, outgroups, and ingroups are all related concepts within phylogenetics but are not the main concern of taxonomists classifying organisms.

When Taxonomists Classify Organisms Using a Phylogenetic Approach, They Are