Asorting device made up of a system of choices that is used to classify organisms is called

A  Key  is   a sorting  device  made   up  of  a  system  of  choices  that   is  used   to   classify  organism.  An  identification  key  is  a  printed    or  computer  aided    device   that  help  in  identification  of   biological  entities  such  as  animals, plants,  fossils ,  micro organisms  and  pollen   grains. The  common  key   is  the   dichotomous  key. In  the  key  there  is  sequence  and    structure  of  identification  steps.

The answer is joseph is observing the colour of the reaction mixture to see whether proteins are present in the given solution.

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