They can be presented as a table of questions, or as a branching tree of questions. Dichotomous keys use questions to which there are only two answers. A key will usually ask questions based on easily identifiable features of an organism. This has pictures and descriptions of organisms so that the scientist can compare what they see with the data in the key. In this case, the scientist consults a key. When sampling a habitat, there is the possibility that a scientist will come across organisms that they do not recognise.
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