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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]
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Ileum, caecum and colon of rabbit, showing Appendix vermiformis on fully functional caecum The human vermiform appendix on the vestigial caecum. The appendix was once believed to be a vestige of a redundant organ that in ancestral species had digestive functions, much as it still does in extant species in which intestinal flora hydrolyze cellulose and similar indigestible plant materials. [10]
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Atavism can also be seen in humans who possess large teeth, like those of other primates. [9] In addition, a case of "snake heart", the presence of "coronary circulation and myocardial architecture [that closely] resemble those of the reptilian heart", has also been reported in medical literature. [ 10 ]
No, a 1040 is not the same as a W-2, but you use the information included on a W-2 to complete the 1040 form. A W-2 is the form employers use to report the wages paid to an employee during the year.
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This reflex formation of goosebumps when cold therefore has a useful function in humans with thick body hair, but the reflex to form them under stress is vestigial. No source is cited to provide evidence that even “particularly hairy humans” are hairy enough to trap a sufficient volume of air to be considered an efficient thermoregulatory ...
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