Scientists routinely explore whether two different animal species have evolved from a recent common ancestor. is the least useful technique to with this determination.
a. analysis of strands of dna
b. comparisons of bones and muscles
c. comparisons of items eaten for food
d. studies of embryos during development

The least useful technique in the study is C. Comparisons of items eaten for food. This is the least scientific method of studying two different species because many animals can want the same food and not have any relation with each other. It isn't considered an important factor in determining the similar characteristics of species, especially in terms of genetic makeup.