Answer:
The emergence of a highly competitive species, Homo sapiens.
Step-by-step explanation:
Neanderthals were the closest ancestors to the human being we know, however, the body structure of Neanderthals, the less developed brain and the adverse climate of the region where they lived made the emergence of Homo sapiens a great plot twist responsible for the end of Neanderthals .
This is because Homo sapiens had characteristics that made it a very competitive species. These characteristics were advantageous in relation to the characteristics of Neanderthals. Among these characteristics we can mention the production of keratin to strengthen the skin, and the efficient covering of hair and nails that protected against the cold.