The common ancestor shared by modern primates and humans is believed to have lived around 25-30 million years ago during the Oligocene epoch. This ancestral species was likely a small, tree-dwelling mammal that lived in the forests of Africa.
This common ancestor possessed a number of key characteristics that are shared by both modern primates and humans. These include forward-facing eyes for improved depth perception, grasping hands and feet with opposable thumbs, and a relatively large brain compared to body size. These traits were likely adaptations for life in the trees, where this ancestral species would have needed to navigate complex environments and manipulate objects in order to survive.
Over millions of years, this ancestral species gave rise to a diverse array of descendants, including the various species of modern primates such as monkeys, apes, and humans. Through the process of evolution, these descendants adapted to a wide range of environments and ecological niches, leading to the diversity of primate species that we see today.
While modern primates and humans have evolved in different ways and adapted to different lifestyles, they still share a number of key similarities that can be traced back to their common ancestor. These similarities provide valuable insights into our shared evolutionary history and help us to better understand the relationships between different primate species.
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