Ascientist has correctly gone through all the possible steps in a dichotomous key, but has not identified an insect. which most likely describes why he did not identify the insect?

The answer to this question is letter C. The organism evolved during identification.
A scientist has correctly gone through all the possible steps in a dichotomous key, but has not identified an insect. He was not able to identify the insect because the organism evolved during identification. 

Choices to this question are:
A) The scientist must have made a mistake.
B) The insect might be an unknown variation or a new species.
C) The organism evolved during identification.
D) The dichotomous key had to many questions.

Answer;

The insect might be an unknown variation or a new species.

Explanation;

A dichotomous key is a biological tool that is used by scientists to identify unknown organisms. It is used to identify organisms in an ecosystem such as trees, mammals, fish, etc.Dichotomous key consist of a series of steps or statements about a specific characteristics of organisms that leads to the correct name of a given organism.If the scientist went through all the possible steps correctly in a dichotomous key and was unable to identify the insect, it means the insect might have been unknown variation or a new species.