- Introduction
- Views regarding the evolution of human beings
- Earlier forms of human & their parent resemblance
- Origin of humans
- Technical division of human beings
- Afarensis & their origin
- Homo erectus an evolutionary ancestor of modern humans
- Creationalists & the opposition to the above theory
- Ambiguity regarding the human remains of earlier times
- Opposition to evolution theory
Evolutionary is the complexity of processes by which living organisms established on the earth and have been expanded and modified through theorized changes in form and function. Human evolution is the biological and culture development of the species Homo sapiens, or human beings. Human involved from apes because of their similarities. Human had a decrease in the size of the face and teeth that involved. Early human are classified intent different type families. Creationists believe that human were always human. Evolution is the complexity of processes by which living organisms established on earth and have been expanded and modified through theorize changes in form and function. Human evolution is the biological and culture development of the species.
Human are classified in the mammalian family Primates. In this arrangement, humans, along with our extent close ancestors, and our nearest living relatives, the African apes, are sometimes place together in the family Hominidae because of genetic similarities. Two-legged walking seems to be one of the earliest of the major hominine characteristics to have evolved. In the course of human evolution the size of the brain has more than tripled. The increase in brain size may be related to changes in hominine behaviour. The third major tread in hominine development is the gradual decrease in the size of the face and teeth.
According to the Microsoft Encarta, the fossil evidence for direct ancestors of modern human is divided into the category Australopithecus and Homo, and beings about 5 million years ago. Between 7 and 20 million years ago, primitive apelike animals were widely distributed on the African and, later, on the Eurasian continents. Although many fossil bones and teeth have been found, the way of life of these creatures, and their evolutionary relationships to the living apes and humans, remain matters of active discussion among scientists.
The fossil evidence for human evolution beings with the australopithecines. All the australopithecines were clearly bipedal and therefore apparent hominines. In details of their teeth, jaws, and brain size, however, they modify enough among themselves to explain division into five species: Australopithecus anamnesis, A. Afarensis, A. Africans A. boisei. Homo are also divided in five different spices: Homo erectus, H. habilis, H. sapiens, and H. sapiens.
Afarensis, lived in eastern Africa between 3and 4 billion years ago. This australopithecine had a brain size a little larger than chimpanzees. Some possessed canine teeth somewhat more sticking out than those of later hominines. No tools of any kind have been found with A. afarensis fossils. Between about 2.5 billion and 3 billion years ago, A. afarensis apparently evolved into later australopithecine, A. africanus. A africanus possessed a brain similar to that of its ancestor. However, although the size of the chewing teeth remain large, the canines, instead of sticking out, grew only to the level of the other teeth. No stoon tools have been found in association with A. africanus fossils. The more recent include the A. robustus, limited to southern, Africa, and A. boisei, found only in eastern Africa. The robust australopithecines represent a specialized adaptation because their principal difference from other australopithecines lies in the large size of their chewing teeth, jaws, and jaw muscles.
Homo erectus lived from about 1.8 million to 30,000 years ago. Until recently, Homo erectus, was considered an evolutionary ancestor of modern humans, or Homo sapiens. Homo erectus had a larger brain them earlier hominines. Homo erectus was also a taller, with an evenly face and smaller tooth. Large differences in body size between males and females, characteristics of earlier hominine species, are less evident in Homo erectus specimens. Scientists believe this species lived in Africa between 2 billion and 1.5 million years ago. H. habilis is the earliest known member of the genus Homo. H. had a larger brain than australopithecines. Australopithecines had long arms and short legs, similar to the limbs of apes. Proportionally, H. habilis resembled modern humans with its limbs and small body size relative to its height. H. habilis had smaller morals teeth and a less raised face than earlier Hominies. H. habilis was taller than australopithecines, but shorter than Homo erectus. H. sapiens