Which of the following statements is accurate regarding H. heidelbergensis?

The statement that H. heidelbergensis had both modern and primitive traits is accurate because this species exhibits a blend of anatomical features characteristic of both earlier hominins and later human species. H. heidelbergensis is known for having a combination of robust features, similar to those of Neanderthals and earlier humans, alongside more modern traits like a larger brain size and flatter face typical of later Homo species.

This species is often viewed as a transitional form, showing evolutionary developments that would eventually lead to modern humans (H. sapiens) as well as Neanderthals. The presence of both advanced and archaic traits reflects its position in the evolutionary timeline, highlighting its role in the study of human evolution and the complexity of traits that can arise through the adaptive processes over time.

Recognizing the mixed characteristics of H. heidelbergensis aids in understanding the gradual changes that took place within the genus Homo, making this statement the most accurate regarding H. heidelbergensis.