Rather, the team concluded that fish gills evolved as a chemical-regulation mechanism. Thus, oxygen-poor blood returning to the heart from the muscle and other organs is not enriched. A. first pair of gill arches. This article answers the following question: What scientific forgery is the myth that “human embryos have gills” based on? This image shows how the hyomandibula receded in fish to … Jawed vertebrates arose from non-jawed vertebrates that had a pharyngeal gill apparatus composed of gill bars and slits. 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. The evolution of the jaw is one of the most significant innovations in vertebrate history. A jaw allowed vertebrates to exploit a wide range of food and engage in predation and defense. By Bjorn Carey 19 January 2006. Question 7 Well, first off, there’s no advantage that would then lead to more babies… which is pretty much job one for evolution. Whales and dolphins did not evolve gills because they are mammals. Or did fish gills evolve at all? These fish may be limited in their aerobic performance a potential selective pressure for the evolution of a coronary circulation. 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 … The second pair of gill arches also became modified and evolved into support structures for the jaw. 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. Shares. 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. When gills became the site of gas exchange, replacing the skin, the heart was left upstream (efferent) the gas-exchanger. The great majority of bony fish species have five pairs of gills, although a few have lost some over the course of evolution. Human Ears Evolved from Ancient Fish Gills. But over evolutionary time, the pill bug’s gills have adapted to life on dry land. In bony fish, the gills lie in a branchial chamber covered by a bony operculum (branchia is an Ancient Greek word for gills). 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