Final answer:
Extant Old World Monkeys are found in the tropical forests of Africa and Asia, and they differ from New World monkeys in several anatomical features, including their nasal structure and dental formula.
Step-by-step explanation:
Extant (living) Old World Monkeys are primarily found in the tropical forests of Africa and Asia. These regions are conducive to their survival and proliferation. Unlike New World monkeys, which evolved uniquely due to reproductive isolation in South and Central America, Old World monkeys include both arboreal and ground-dwelling species. Some Old World species, like the macaques and langurs, have adapted to a degree of synanthropy, living in urban areas and subsisting on human refuse. Remarkably, a few species evolved characteristics suited for aquatic habitats, such as webbed fingers in the proboscis monkey. Importantly, they are distinguished from New World monkeys by their narrow, downward-pointed noses and the dental formula 2.1.2.3, indicating two incisors, one canine, two premolars, and three molars on each quadrant of the jaw.