Final answer:
The organism that would likely be on the extreme right of a phylogenetic tree is the one that has evolved most recently and has more derived characteristics, such as a complex circulatory system. DNA homology is a strong indicator of evolutionary relatedness. Without specific information on organisms A-F, we cannot determine which one it is.
Step-by-step explanation:
To determine which organism would likely be on the extreme right of the phylogenetic tree, we need to consider the evolutionary relationships between the organisms.
A phylogenetic tree represents the evolutionary pathways and connections among organisms, with the root representing the common ancestor and the branches representing divergence into different species or groups.
Organisms that are placed on the extreme right of this tree are generally those that have arisen most recently in evolutionary history and possess more derived characteristics compared to those positioned toward the left or near the root.
If an organism has a complex circulatory system, it is likely more evolved and may represent a higher order of taxonomy such as animals from the Animalia kingdom, potentially including mammals, birds, or reptiles.