Several fields of discrete mathematics, particularly theoretical computer science, graph theory, and combinatorics, are important in addressing the challenging bioinformatics problems associated with understanding the tree of life.

Several institutions, besides those already mentioned, played important parts.

Several billion kilograms of polyesters are produced industrially annually, important products being polyethylene terephthalate, acrylate esters, and cellulose acetate.

Several important cinematic movements, including the Nouvelle Vague, began in the country.

Several types are existent in Qing dynasty and used in dishes of stewing hams ( 火腿炖肘子 ), and vegetables, or for a wide variety of soup and important soup stocks.

Several important institutional changes took place in this period, such as free and mandatory schooling introduced 1842 ( as first country in the world ), the abolishment of a previous national monopoly on trade in handicrafts in 1846, and a stock company law in 1848.

His critically acclaimed book Lyrics on Several Occasions of 1959, an amalgam of autobiography and annotated anthology, is an important source for studying the art of the lyricist in the golden age of American popular song.

Several formerly important franchise courts were not officially abolished until Courts Act of 1971.

Several important buildings and structures were built during this time, including the Kansas City City Hall and the Jackson County Courthouse — both added new skyscrapers to the city's growing skyline.

Several industry groups also recognize light pollution as an important issue.

Several types of molecules are particularly important during morphogenesis.

Several of the more important ways observations can be affected by human psychology are given below.

Several other important engravers also made cards, including Master ES and Martin Schongauer.

Several economically important products come from Rosaceae, including many edible fruits ( such as apples, apricots, plums, cherries, peaches, pears, raspberries, and strawberries ), almonds, and ornamental trees and shrubs ( such as roses, meadowsweets, photinias, firethorns, rowans, and hawthorns ).

Several important political innovations of classical antiquity came from the Greek city-states and the Roman Republic.

Several Referendums supported the state being in control of the most important utilities and energy companies.

Several important modern cities, including Stockholm and Lviv, were founded in the 1250s.

Several important cultural achievements were made in the decade, including publication of Roger Bacon's important scientific work Opus Majus and Thomas Aquinas ' Summa contra Gentiles.

Several lakesthe most important of which are Lake Herăstrău, Lake Floreasca, Lake Tei, and Lake Colentinastretch across the northern parts of the city, along the Colentina River, a tributary of the Dâmbovița.

Several singular oak trees, such as the Royal Oak in Britain and the Charter Oak in the United States, are of great historical or cultural importance ; for a list of important oaks, see Individual oak trees.

Several important trade routes from India and China ( including the Silk Road ) passed through Bactria and, as early as the Bronze Age, this had allowed the accumulation of vast amounts of wealth by the mostly nomadic population.

Several of Gauthier's students are now important moral, political, and legal philosophers in the United States and Canada.

Several important features of visual perception can be traced to the retinal encoding and processing of light.

Several important diseases of the nervous system are associated with dysfunctions of the dopamine system.

Several dentists and patients with special dental problems have experimented with the device.

Several physicians and dentists have settled in Müncheberg providing medical care for the area.

Several technological innovations helped to overcome this 400-year pattern.

Several recent accidents have helped make Indonesia's air transport system one of the least safe in the world.

Several large hotel projects like the Port Charles Marina project in Speightstown helped the tourism industry continue to expand in 1996 – 99, and more recently the new Hilton Hotel on Needhams Point, Saint Michael in 2005.

Several factors may have helped influence the look that has become known as " traditional square dance attire ".

Several more short tours followed, and Smith helped her record one of his songs " I Figured You Out ", which he once called " a stupid pop song in about a minute " that he discarded for sounding " like the fucking Eagles.

Several photoelectric cells helped maintain orientation with respect to the Sun and the Moon.

Several professors helped Covenant move to St. Louis, Missouri where it grew for eight years and in 1964 the institution outgrew its facilities and moved to Lookout Mountain.

Several different producers, including Richie Zito, Matthew McCauley, and Richard James Burgess, helped create an electronic popular style, that was very common during the 1980s, but drastically different from America's usual style.

Several of the children and staff were also ill, and Zita ( at the time eight months pregnant ) helped nurse them all.

Several accessories including pinstriping and luggage racks helped provide further individuality.

Several American Jewish organizations helped them obtain visas and aided their resettlement in the United States and other countries.

Several long, thin bones identified on the blocks as ossified tendons ( structures that helped stiffen the tail of Deinonychus ) turned out to actually represent gastralia ( abdominal ribs ).

Several Muslim generals, such as Ma Zhan ' ao, Ma Anliang, Ma Qianling, Dong Fuxiang, and Ma Haiyan from Hezhou, who had defected to General Zuo's army, helped him crush the " Muslim rebels ".

Several years later, he helped build the new Victory-class destroyer vessels.

Several years later, when Chisholm worked on a bill to give domestic workers the right to a minimum wage, Wallace helped gain votes of enough Southern congressmen to push the legislation through the House.

Several other organizations in both Europe and North America helped develop experimental film.

Several manga-style American artists led by Art Director: Thomas Cook include Matt Holmberg, Rich Werner ( Main character designer for Kybar's Teeth, Weave, Paradwyn, Bograth, Nar and The Sands of Dresh ), Tim Gillette, Chana Goodman, and Ryan Shreve helped to expand the universe of art based on the original creations of Matt Holmberg.

Several additional recurring characters appear in Pirates fiction, including Blackheart, a pirate similar to the historical Blackbeard ; the Crimson Angel, another mysterious female pirate ; and even non-pirates such as Charles Southwyn, a weaponmaster who helped create several ships in the Pirates of the Spanish Main release.

Several early Cleveland miscues helped the Broncos jump to an early 14-0 lead.

Several of the Commission members, including Daniel Burnham and Frederick Law Olmsted, Jr. had in fact participated in the 1893 World Columbian Exposition, which was widely popular and helped to spread interest in the City Beautiful movement.

Several faces came out to help and then Jimmy ran out and helped take him to the back.

Several experiments have documented an interesting, unexpected example of social influence, whereby the mere knowledge that others were present reduced the likelihood that people helped.

Several churches located along the avenue, such as Big Bethel AME and First Congregational, helped build and maintain the heritage of the street.

Several years after ECW folded, Sabu and Rob Van Dam reunited at World Wrestling Entertainment ( WWE ) produced ECW One Night Stand in 2005, when Van Dam helped Sabu defeat another former ECW wrestler, Rhyno.