To classify an organism a scientist finds in the field, which of these will the scientist first compare to other known organisms?
a. dietary habits
b. ecological niche
c. physical structure
d. reproductive method

The answer is C. Physical structure.

Different species can share dietary habits, ecological niches, and reproductive method although they are not related. So, classifying organisms based on these features is not helpful a lot. It is known that different species differ in DNA sequence. Since physical structures are determined by DNA sequences, physical structures could show in first sight difference between species. Therefore, to classify organism found in the field, the scientist will start from comparing its physical structures to the other known organisms.

Used to water and cool climates, probably not thick coated or fluffy. they most likely have thin coats and have to survive to find food. sorry if this wasn't the answer you were looking for..: )