The relationship between humans and early hominins is obviously identifiable. Many traits that non-human primates demonstrated, give anthropologists the evidence necessary to place early hominins in the link of human ancestry. Bipedalism for example, links us orrinin and ardipithecus.
Ardipithecus ramidus demonstrates dental anatomy that is strikingly similar to that of modern humans, in that their large canine teeth was structured in a way that is similar to what we know as incisors. Ardipithecus garhis, a later hominin species, also shared similar dental anatomy traits to that of homo sapiens. Ardipithecus garhis had teeth that closely resembled our front teeth as well as the structure of our molars.
Fossilized skeletal remains of early human ancestors aid in teaching us about the the important elements of human history, as well as the histories of other species. Having skeletal remains as a means of reference allows us to study the life experiences of different species. We can identify means of survivals, areas of adaptation, diet, living environment etc.
Being able to see the variation among species allows anthropologists to pinpoint what adaptations were successful, which ones were not, and which ones changed the path of human evolution to land us where we stand (on two feet) today. Identifying traits that we as modern human shared with primitive non-human primates provides us with an incredibly telling map of human history and development, and lays the foundation in explaining ways in which are still surviving and adapting to environments.
Finding the links in that piece human evolution together gives us a timeline of development and showcase just how much we’ve adapted and puts into perspective just how far this species has come, and how long and hard of journey it’s been to place us where we are today.