It turns out that humans walking on two legs use only one-quarter of the energy that chimps use while knucklewalking on four limbs(肢).And the chimps, on average, use as much energy using two legs as they did when they used all four limbs....
Why did humans evolve? Why is science literacy important? Why do human eyes not reflect light? Why do human knees bend forward? Why do humans have to learn to swim while other animals can do it from birth? Why do some adults not have fine motor skills?
Did humans evolve from Homo habilis? What happened to the Homo neanderthalensis? How did Homo habilis walk? How did Homo habilis differ from earlier australopithecines? How was Australopithecus sediba dated? Did Australopithecus boisei walk upright? Are gorillas considered hominids? When was Australo...
根据第一段Heat might explain why we lost our fur and now strike an upright and slim pose.(热度可以解释为什么我们失去了皮毛,现在摆出直立和苗条的姿势。)和第三段A new study supports the theory that heat helped drive human evolution (进化), by showing that a key source of human evolution ...
New work from my colleagues and I has shown that two of these often misunderstood bones, the medial and lateral fabellae, which are behind the knee, could have evolved in multiple ways in primates and helped early humans learn to walk upright. The research was a systematic review of thr...
But if hair can lead to harm, why did we keep it on our heads? As bipeds, or animals that walk upright on two legs, our heads are directly exposed to the sun. Near the equator, where humans evolved, sun exposure can be overbearing, and head hair helps people avoid overheating. "It...
Why did we evolve to be so different? This question becomes even more acute when we compare ourselves with our closest relatives among the world's mammal species, the great apes (as distinguished from the gibbons or little apes). Closest of all are Africa's chimpanzee and bonobo, from ...
Did Homo habilis show more cranial expansion than Homo erectus? Did Homo erectus evolve into Homo heidelbergensis? Is Homo habilis an example of anagenesis? Did Homo habilis climb trees? Did humans evolve from Homo habilis? Was Homo habilis sexually dimorphic? How does Homo differ from Australopith...
What happened to Homo habilis? How long did Homo habilis live? Why are great apes endangered? Who discovered Homo floresiensis? Did Homo sapiens kill Homo erectus? Was Homo floresiensis bipedal? When did Homo ergaster go extinct? Did the Homo floresiensis walk upright? Why did Homo sapiens ...
How did chimpanzees evolve? Why does the orangutan grow slowly? Why are great apes important? Why do non-human primates have long torsos? Why are orangutans endangered? Do chimpanzees have claws? How do chimpanzees give birth? How are chimpanzees and humans alike? Can chimpanzees climb to the...