Hominin Split: They were the first primates that left the trees and stood up in grassland approximately 7 to 6 million years ago. They were called spilt because this separates hominins which are basically any primates that stands at least part time from other primates like Chimpanzees, apes, Gorillas and etc. They were historically important because they were the first primates to stand up in grass land so that they can hunt and survive their life more easily comparing to other primates who didn’t stand up and which gives us idea about that from them evolution of modern man have started gradually.