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The muscles connected to the ears of a human do not develop enough to have the same mobility allowed to monkeys. Arrows show the vestigial structure called Darwin's tubercle. In the context of human evolution, vestigiality involves those traits occurring in humans that have lost all or most of their original function through evolution. Although ...
Vestigiality is the retention, during the process of evolution, of genetically determined structures or attributes that have lost some or all of the ancestral function in a given species. [1] Assessment of the vestigiality must generally rely on comparison with homologous features in related species.
This phenomenon is an automatic-response mechanism that activates even before a human becomes consciously aware that a startling, unexpected or unknown sound has been "heard". [2] That this vestigial response occurs even before becoming consciously aware of a startling noise would explain why the function of ear-perking had evolved in animals.
Explanation of current form in terms of a historical sequence: Static view Explanation of the current form of species: How vs. why questions: Proximate view How an individual organism's structures function Ontogeny (development) Developmental explanations for changes in individuals, from DNA to their current form Mechanism (causation)
Homo naledi is an extinct species of archaic human discovered in 2013 in the Rising Star Cave system, Gauteng province, South Africa (See Cradle of Humankind), dating to the Middle Pleistocene 335,000–236,000 years ago. The initial discovery comprises 1,550 specimens of bone, representing 737 different skeletal elements, and at least 15 ...
A symbolic portrayal of human evolution, showing developmental stages as a matter of illustration. "Missing link" is a recently-discovered transitional fossil.It is often used in popular science and in the media for any new transitional form.
[2] [5] The classification H. habilis began to receive wider acceptance as more fossil elements and species were unearthed. [2] In 1983, Tobias proposed that A. africanus was a direct ancestor of Paranthropus and Homo (the two were sister taxa ), and that A. africanus evolved into H. habilis which evolved into H. erectus which evolved into ...
Early human ancestors had a tail where modern humans’ tail bone is located. This aided in balance when in the trees but lost its prominence when bipedalism was adapted. The arms also became shorter (opposite in comparison to legs) for carrying objects and using them as multi-tasking agents instead of climbing and swinging in trees.