Thus, oxygen-poor blood returning to the heart from the muscle and other organs is not enriched. The evolution of the jaw is one of the most significant innovations in vertebrate history. The thesis that living things go through various stages in their mothers’ wombs that can be seen as evidence for evolution has a special position amongst the unfounded claims of the theory of evolution. Whales and dolphins did not evolve gills because they are mammals. Rather, the team concluded that fish gills evolved as a chemical-regulation mechanism. The first pair of gill arches (skeletal rods that support the gill slits) are thought to have become modified so that they became a hinged jaw. But over evolutionary time, the pill bug’s gills have adapted to life on dry land. This article answers the following question: What scientific forgery is the myth that “human embryos have gills” based on? The second pair of gill arches also became modified and evolved into support structures for the jaw. Jawed vertebrates arose from non-jawed vertebrates that had a pharyngeal gill apparatus composed of gill bars and slits. The great majority of bony fish species have five pairs of gills, although a few have lost some over the course of evolution. Or did fish gills evolve at all? Contrary to popular belief, fish did not evolve gills to obtain more oxygen as they grew larger and became more active – the adaptation arose to allow them to survive acidic ocean conditions. These fish may be limited in their aerobic performance a potential selective pressure for the evolution of a coronary circulation. When gills became the site of gas exchange, replacing the skin, the heart was left upstream (efferent) the gas-exchanger. A team reports in the journal Proceedings B that fish gills may not have evolved to help fish breathe—the standard belief among evolutionary biologists. This image shows how the hyomandibula receded in fish to … Like many successful features found in nature, Metaspriggina’s pairs of gill arches did not necessarily evolve for the purpose of eating or chewing.Some scientists … Question 7 In bony fish, the gills lie in a branchial chamber covered by a bony operculum (branchia is an Ancient Greek word for gills). These branchial rays articulate with the gill arch cartilages in a way that is broadly reminiscent of the articulation between pectoral fins or limbs and the shoulder girdle, and this similarity led the comparative anatomist Carl Gegenbaur to propose that paired fins and limbs evolved by transformation of a gill arch (Gegenbaur, 1878) (Fig. Well, first off, there’s no advantage that would then lead to more babies… which is pretty much job one for evolution. By Bjorn Carey 19 January 2006. A. first pair of gill arches. Human Ears Evolved from Ancient Fish Gills. 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