Modern humans have orthognathic faces due to canine crown and root size reduction.

Most primates must supplement their diets with Vitamin C foods. Without dietary Vitamin C, primates are susceptible to scurvy — a potentially lethal dietary disease.

Identifying the Common Ancestor at the base of an adaptive radiation is always difficult. The Common Ancestor will retain primitive traits and will have derived traits seen in descendant taxa. Unfortunately, sister taxa to the Common Ancestor will have similar primitive traits and may have a few of the later derived traits without being directly ancestral to the line descended from the Common Ancestor.

Match primate with most exclusive (most specific) taxon.

Match Mortality Risk with Weight Category

If the humans of the Pliocene epoch are defined by bipedalism, it is fair to say that their Pleistocene descendants are defined by brain enlargement.

Match paired primates with their most exclusive (most specific) taxon.

The medium stature and heavily-muscled bodies of Homo neanderthalensis appear to be related to cold-weather adaptations.

Bone A = Ischium Bone B = Ilium Bone C = Pubis (or Pubic Bone)

Like earlier humans, Homo erectus arose in East Africa.