Which Organisms are Most Closely Related?

Explanation:

Genus: Genus is a group of species that have some common morphological features but cannot interbreed. In this case, Anas discors and Anas americana belong to the same genus "Anas," making them more closely related compared to other pairs in different genera.

Anas discors and Anas americana represent two different species within the genus "Anas," which indicates a closer genetic and evolutionary relationship between them. This relationship is based on shared characteristics and ancestry within the same genus.

By being part of the same genus, Anas discors and Anas americana are likely to have a more recent common ancestor and share more similarities in terms of genetic makeup and evolutionary history. Therefore, they are considered to be most closely related among the options provided.