What adaptation is linked to better blood flow in Neanderthals?

The adaptation linked to better blood flow in Neanderthals is large nasal apertures. These features are believed to have played a crucial role in their ability to efficiently warm and humidify cold air before it reached the lungs in the harsh climates they often inhabited. The larger nasal passages would facilitate increased airflow, which could enhance oxygen uptake, thereby supporting their metabolism and physical endurance.

In addition, the structure of the nasal cavity and its larger size is often associated with adaptations to cold environments, where breathing in cold air could lead to respiratory issues if not properly managed. Thus, having large nasal apertures would not only improve functionality in colder climates but also support better blood flow and overall respiratory efficiency for Neanderthals as they engaged in their daily survival activities.