that they lived in warm climates and were adapted to life in and around trees which supports the arboreal hypothesis proposed by Sir Grafton Elliot Smith and Frederic Wood Jones. The hypothesis explains that primates were adapted to live in trees thus the necessity of grasping hands and feet for grabbing branches, and binocular vision which led to better depth perception important for judging distance between trees.

Grade I - The Lemuroids Evolving out of the late Paleocene and early Eocene Epoch . The Lemuroids were the first of the early primates to resemble primates that are living today. Equipped with a slightly larger brain, flat nails and changes to their cranial structure that indicate that they relied more on their vision than their predecessors.

Grade II - The Tarsiers Eocene Epoch, a time period when the climate was pretty warm and several land bridges stretched between the continents. It is also during this epoch that major changes to fault lines occured. The Separation of Antartica and Australia created the circum-atlantic current which sparked a change in circulation patterns in the ocean resulting in global cooling, eventually leading to the Ice Age. This is when the Tarsiers came to be, most likely originating in asia

Grade III - The Monkeys …show more content…
Though the continents were positioned close to where they are today but north and south amerca were not connected and austalia and antartica separated. This change caused the ocean currents to change around newly frozen antartica. These geological changes caused changes in the climate as well, there was a drastic drop in temperatures and a drop of the sea level caused by much of the oceans water being frozen at the poles. The drop in temperatures removed the early prosimians that populated North Amercia and