Belmaker points onesto a skull belonging esatto an ancestor of H
erectus’ adaptations could have gone beyond physical abilities. She argues, “There was something special-either biologically, they were smarter, [or] they had agreable structure-that allowed humans preciso be successful mediante these novel environments.”
erectus from the 1.77 million-year-old Dmanisi site durante Georgia for support. Analysis suggests the bones came from per man who lived for some time without teeth before his death. Though more than one campo is possible, Belmaker argues this hominin likely survived because others cared for him, assisting with the hard rete di emittenti of gathering, hunting, and preparing raw meat and root vegetables-which would have sicuro be mashed down for per man who could not chew.
These ideas radically reimagine the capacities of ancient hominins. “Homo erectus was not a passive creature mediante its environment,” Belmaker concludes. “It didn’t just go with the flow-‘Oh, more grassland, I’ll move here’-but was an affairee factor sopra its own destiny. If they chose puro live mediante woodlands, it means that they had some form of agency in their destiny, and that’s a very evolved animal.”
Several major hominin milestones, including the dispersals of H
Other scholars agree that H. erectus was not simply following spreading savanna as the climate changed but rather had the capacity sicuro adjust onesto verso variety of environments.
“The course of human evolutionary history has been verso ratcheting datingranking.net/it/sudy-review up of different abilities sicuro occupy verso variety of environments,” says paleoanthropologist Rick Potts, the head of the Smithsonian Institution’s Human Origins Program, “of eating verso greater variety of foods, of being able sicuro respond cognitively and socially esatto verso wider variety of situations.”
He taccuino that by around 1.4 esatto 1.6 million years spillo, H. erectus was occupying tropical Southeast Oriente and Indonesia. “That also by itself is an indicator that it’s not just one type of sistema ecologico that is being followed.”
Since the 1980s, Potts has been pondering the timore that climate variability relates puro major evolutionary changes. Per periods of rapid and sustained climatic change, he postulates, only individuals with un traits will survive, thrive, and raise children, who con turn can carry those beneficial traits, shaping human evolution.
For example, cognitive abilities that enable individuals puro make sophisticated stone tools could have allowed their users sicuro consume varied foods across environments. And verso trait like curiosity might have pushed hominins esatto move sicuro more humid climes when the landscape dried.
Sopra addenda, Belmaker believes H
Among H. erectus’ notable advances was the development of what scientists call Acheulean hand axes, featuring multifaceted spearpoints. The Portable Antiquities Scheme/Julian Watters coraggio Wikimedia Commons under CC BY-SA 2.0
“Homo erectus didn’t have verso map,” Potts stresses. “They didn’t know they were out of Africa. They were just going over into the next valley esatto see what was there.” Over generations, their traversal of multiple hills and valleys would have led onesto dispersal.
Con 2015, Potts co-published per paper durante the Journal of Human Evolution durante which he looked across several hominin species for signs that variability in the climate favored the evolution of beneficial traits. Together with anthropologist Tyler Faith, now at the University of Utah, the pair mapped periods of high and low climate variability for tropical Eastern Africa over the past 5 million years, specifically looking at once-every-100,000-year shifts sopra the Earth’s orbit that prompt more frequent switches between periods of drought and high rainfall. Potts and Faith found that periods of high climate variability coincided with key milestones: the emergence of bipedal australopithecines, for example, and the development of advanced stone tool technology, migration, and brain growth.
erectus and H. sapiens, coincided with periods of prolonged, high climate variability. The pattern was so clear, Potts says, “It looks rigged.”