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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 ...
In humans, the vermiform appendix is sometimes called a vestigial structure as it has lost much of its ancestral digestive function.. 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]
The most efficient jet-propelled organisms are the salps, [166] which use an order of magnitude less energy (per kilogram per metre) than squid. [171] The free-swimming sea slug Phylliroe is notable for being a pelagic hunter that resembles a fish in body plan and locomotion, with functional convergences. [172]
Another example of organisms adapting to human-caused conditions are Nylon-eating bacteria: a strain of Flavobacterium that are capable of digesting certain byproducts of nylon 6 manufacturing. There is scientific consensus that the capacity to synthesize nylonase most probably developed as a single-step mutation that survived because it ...
Homology includes a unique group of shared structures referred to as vestigial structures. Vestigial refers to anatomical parts that are of minimal, if any, value to the organism that possesses them. These apparently illogical structures are remnants of organs that played an important role in ancestral forms.
What makes a human body structure vestigial is that presently it is useless or almost useless, i.e. having no important function. Greensburger ( talk ) 16:49, 1 September 2011 (UTC) [ reply ] The references you listed do not backup your statements, they mention mainly the appendix, and a few other structures.
Pharyngeal clefts resembling gill slits are transiently present during the embryonic stages of tetrapod development. The presence of pharyngeal arches and clefts in the neck of the developing human embryo famously led Ernst Haeckel to postulate that " ontogeny recapitulates phylogeny "; this hypothesis, while false, contains elements of truth ...
The energy required for metamorphosis detracts from individual fitness, and neotenous individuals can utilize available resources more easily. [38] This trend is seen in a comparison of salamander species at lower and higher altitudes; in a cool, high-altitude environment, neotenous individuals survive more and are more fecund than those which ...