Scientists classifying modern animals are most likely to compare the---

A) structure of the animals' ATP

B) function of the animals' limbs

C) composition of the animals' bones

D) sequence of the animals' DNA

The correct answer is letter D. The sequence of an animals' DNA is most likely the variable that scientists will look into to study it further. Knowing the genetic make-up of a particular organism is important so that they can be classified in particular groups and communities within an ecosystem.