Final answer:
Homo erectus characteristics include pronounced brow ridges, thick skull bones, bipedalism, humanlike feet, a brain size ranging from 775 to 1,100 cubic centimeters, and advanced survival and social behaviors such as tool use and caring for the infirm.
Step-by-step explanation:
The physical characteristics and morphology of Homo erectus are distinct and well-documented. Homo erectus displayed a number of defining features that differentiated it from its predecessors as well as from modern humans (Homo sapiens). This species had a projecting nasal spine, thick skull bones, and pronounced brow ridges. The skull shape was more like that of Homo erectus or Homo habilis, accompanied by small jaws and teeth, and a characteristic sagittal keel—a small raised ridge running along the top of the skull. Homo erectus also exhibited bipedal locomotion with a human gait and humanlike feet equipped with arches and ankles.
Further distinguishing characteristics include a brain size ranging from 775 to 1,100 cubic centimeters, a height similar to modern humans up to 1.85 meters, a lesser degree of sexual dimorphism, and a larger third molar compared to other molars. Their nose pointed downward, an adaptation likely helpful in colder climates. Notably, Homo erectus was capable of using fire, crafting sophisticated tools, possibly constructing huts, and may have had the capacity for vocal communication, indicating social and cooperative behavior.