An example of a parallel choice on a dichotomous key is___

a. old or young

b. happy or sad

c. brown hair or black hair

C) old or young

A dichotomous key is a tool or a used assessment that is utilized by most scientists like biologist and ecologist to organize and classify organisms into sets of classifiable structures like trees, animals, birds, cats, dogs. These are broad descriptions that systematizes a whole family of species into a set category or a whole kingdom in a simple language such as plants or animals.