biology - chp 18 - dichotomous key - powerpoint
Post on 10-Aug-2015
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Dichotomous Key• Key used to identify an
organism by choosing from pairs of descriptions of characteristics of the organism
Rules for using a dichotomous key
1. Always start at the top
2. Compare one organism at a time, read the choice and decide if yes or no.
3. Follow next step and eliminate options until its narrowed down to just one
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