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To conduct a phylogenetic analysis, an outgroup is needed in order to: all of these choices are correct. determine which character states are ancestral and which are derived. decide which molecular data to use. determine which characteristics to include in our analysis. decide which characters are analogous and which are homologous.

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W0lf93
Determine which character states are ancestral and which are derived. This is an external group that is used to make a phylogenetic analysis that is the set of evolutionary of species and gender, showing their origin and origin. Applied as a method of analysis and reconstruction of information on species classifications. For this it is necessary to determine the ancestral state and its derivatives.

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