Based on the research of philip reno, early hominins show reduced sexual dimorphism, which is evidence for cooperation and likely for "pair bonding".
Pair bonding is an advanced characteristic and may assume a basic part in generation, and additionally in individual and species survival. A pair bond is the solid liking that creates in a few animal groups between a couple comprising of a male and female, or at times as a same-sex blending, possibly prompting delivering posterity or potentially a deep rooted bond.
