Search results
Results from the WOW.Com Content Network
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 structures called vestigial often appear functionless, a vestigial structure may retain lesser functions or develop minor new ones.
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. The emergence of vestigiality occurs by ...
He discovered that the parietal eyes were made up of sensory cells similar to the cone cells of the retina, [75] and suggested that it was a primitive light-sensor organ (photoreceptor). [80] The pineal gland was originally believed to be a " vestigial remnant" of a larger organ.
Pages in category "Vestigial organs" The following 12 pages are in this category, out of 12 total. This list may not reflect recent changes. Human vestigiality
Evidence of common descent of living organisms has been discovered by scientists researching in a variety of disciplines over many decades, demonstrating that all life on Earth comes from a single ancestor. This forms an important part of the evidence on which evolutionary theory rests, demonstrates that evolution does occur, and illustrates the processes that created Earth's biodiversity. It ...
The third molar, commonly called wisdom tooth, is the most posterior of the three molars in each quadrant of the human dentition. The age at which wisdom teeth come through (erupt) is variable, [ 1 ] but this generally occurs between late teens and early twenties. [ 2 ] Most adults have four wisdom teeth, one in each of the four quadrants, but ...
The nictitating membrane is a transparent or translucent third eyelid present in some animals that can be drawn across the eye for protection and to moisten it while maintaining vision. The term comes from the Latin word nictare, meaning "to blink". It is often called a third eyelid or haw, and may be referred to in scientific terminology as ...
Homology (biology) The principle of homology: The biological relationships (shown by colours) of the bones in the forelimbs of vertebrates were used by Charles Darwin as an argument in favor of evolution. In biology, homology is similarity due to shared ancestry between a pair of structures or genes in different taxa.