Final answer:
European H. heidelbergensis exhibited several features that foreshadowed the morphology of European Neandertals, including the shape of the skull, large brow ridges, and robust postcranial bones, which illustrate the evolutionary transition to Neandertal form.
Step-by-step explanation:
The variable features of European H. heidelbergensis that foreshadow the morphology seen in European Neandertals (Homo neanderthalensis) are numerous and reveal an evolutionary transition towards the Neandertal form. Some of these features include the occipital bun, large brow ridges, a large nasal cavity, and incisors with a rounded pattern of wear. Additionally, like the Neandertals, H. heidelbergensis individuals had robust postcranial bones such as a broad scapula, indicative of strong rotator cuff muscles, and a robust humerus, which suggests they had the capability for throwing projectiles and using spears. The skull shape of H. heidelbergensis, which was flattish on top and rounded at the back, is reminiscent of that of Neandertals. Neandertals had skulls that were larger and flattish on top with a noticeable rounding at the back, distinctively thick brow ridges, large nasal cavities, and exhibited heavy wear on their large front teeth. These similarities with H. heidelbergensis suggest that H. heidelbergensis features were precursors to the Neandertal morphology in Europe. The cultural behaviors of H. heidelbergensis, such as modifying dwellings and sites for their use, also set the stage for the similarly complex behaviors observed in Neandertals.