Question

Scientists study the evolutionary relationships of species to better understand the history of life on Earth. Describe two methods that scientists can use to determine whether two species (modern or extinct) are closely related.

Answer 1

Scientists use several methods to determine the proximity between species. Two of those methods may be an anatomical comparison, by examining the skeleton structure of two species, and DNA composition comparison, by comparison of genes, or specific parts of the DNA, that allow establishing the relative distance between species.