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 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 disciplines have developed as separate branches of comparative law, including comparative constitutional law, comparative administrative law, comparative civil law ( in the sense of the law of torts, delicts, contracts and obligations ), comparative commercial law ( in the sense of business organisations and trade ), and comparative criminal law.

Several modern theories have ventured to explain this decline, including the breakdown of trade routes to supply the needed metals, the lack of trace impurities in the metals, the possible loss of knowledge on the crafting techniques through secrecy and lack of transmission, or a combination of all the above.

Several authors have argued that the debate was merely to regulate trade and collect a tax.

Several sources of current news exist about the trade union movement in the world.

Several conflicts about trade privileges were fought by Lübeck and the Hanseatic League against Denmark and Norway with varying outcomes.

Several church-related groups are working to promote sexual abstinence until marriage and fidelity in marriage and to prevent child exploitation ; they care for victims of Thailand's massive sex trade as well.

Several Latin American countries approached the U. S. after the announcement, seeking to negotiate their own bilateral free trade agreements with the U. S., but the U. S. refused to negotiate more bilateral PTAs in the region until NAFTA was implemented.

Several towns and villages grew up along the canal, as it carried much trade and passenger traffic during its peak years.

Several others were dedicated to almost exclusively to Demopolis and the cotton trade, including the Allen Glover, Canebrake, Cherokee, Demopolis, Frank Lyon, Marengo, and the Mollie Glover.

Several thousand Huron lived as far south as present-day central West Virginia along the Kanawha River by the late 16th century, but they were driven out by the Iroquois, who invaded from present-day New York in the 17th century to secure more hunting grounds for the beaver trade.

Several prominent families developed as a result of the cloth and leather trade, beginning in the 14th century, including Gottrau, Lanthen, Affry, Diesbach ( originally from Bern ), Von der Weid, Fegeli, and Weck.

Several foundlings appear in Terry Pratchett's Discworld: most notably Captain Carrot Ironfoundersson ( found as a toddler among the ruins of a caravan party attacked by bandits, surrounded by the bodies of the adults ; Carrot was adopted and raised by the dwarfs who discovered him, and was surprised to learn at age 16-and 6ft 6in tall-that he was not a dwarf ; mounting evidence suggests that Carrot is the scion of the deposed Ankh-Morpork royal family, but he himself has suppressed this as much as possible, considering the role of police captain to be a preferable one in which to safeguard his city and keep order ), also Tomjohn ( rightful heir to the throne of Lancre, rescued from his father's killer by loyal servants, entrusted to the local witches and given to travelling actors to raise ; Tomjohn eventually returns to the kingdom, but does not wish to rule it, preferring to remain an actor ) and Keith ( The Amazing Maurice and His Educated Rodents-ironically, Malicia, obsessed with fairytales, is certain that this makes him likely to be a prince, but Keith explains that it is common in the city to abandon babies outside the Guilds where they are likely to receive care and training in a trade ).

Several people working for the group were killed, and trade unions were initially suspected of hiding some of the attackers in their organizations, though the same terrorists later targeted trade unionists like Guido Rossa.

* Black Eagle tank ( prototype: cancelled ): Several Russian prototypes shown at trade shows, with a longer chassis and extra pair of road wheels, and very large turret with separate ammunition compartment.

Several new plants were introduced to Europe in trade with both the Zengids and Ayyubids, including sesame, carob, millet, rice, lemons, melons, apricots, and shallots.

Several other factors also contributed to the flowering of trade, industry, the arts and the sciences in the Netherlands during this period.

Several trade organizations, such as the Trade Federation and Commerce Guild, kept armies of droids in order to protect their profits and occasionally took advantage of this, such as when the Trade Federation invaded and occupied Naboo, resulting in the Battle of Naboo.

Several marine species of hermit crabs are common in the marine aquarium trade.

Several companies operate trips on the river, including Dart Pleasure Craft Limited, who also trade as River Link and operate the Passenger Ferry between Dartmouth and Kingswear.

Several people who became members sent letters to Justice, the journal of the Social Democratic Federation, attacking trade union leaders and bureaucracy for their compromising stance, a line of criticism echoed by other impossibilists such as Daniel De Leon.

Several thousand Huia were exported overseas as part of this trade.

Several other locations were considered, but due to the continuing resistance of nearby inhabitants ( backed by the Solidarity trade union ), planned mast height and transmitter range were both greatly reduced, and an old military site just southeast of Solec Kujawski was chosen.