WebFish Family Key. This is a dichotomous key. Compare the two descriptions for each couplet, starting with couplet 1, to see which best fits the fish you are identifying. Then … WebA dichotomous key is a tool that taxonomists often use to classify organisms correctly. It is a form of hierarchical grouping that involves making decisions in a series of steps, from general differences to very specific differences. It is called a di chotomous key because there are always two choices.
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