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what were the problems with traditional classification?

scientists relied on body structure, and the problem was that very different organisms evolved with similair structures making the classification hard

how do scientists classify organisms now?

they group with similar lines of evolutionary history

species place within the same genus

should be more closely related to one another than to species of any other genus

evolutionary classification

grouping organisms together based on their evolutionary history

derived characters

characteristics that appeared in recent parts of the lineage but not in the older ones


shows evolutionary relationships between organisms

molecular clock

uses DNA comparisons to estimate the length of time that 2 species have been evolving independent

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