A frog is any member of a diverse and carnivorous group of short-bodied, tailless amphibians composing the order Anura. The oldest fossil "proto-frog" appeared in the early Triassic of Madagascar, but molecular clock dating suggests their origins may extend further back to the Permian, 265 million years ago. Frogs are distributed, ranging from the tropics to subarctic regions, but the greatest concentration of species diversity is in tropical rainforests. There are accounting for over 85 % of extant amphibian species, they are one of the five most diverse vertebrate orders. Warty frog species tend to be called toads, but the distinction between frogs and toads is informal, not from taxonomy or evolutionary history. An adult frog has a stout body, protruding eyes, anteriorly-attached tongue, limbs folded underneath, no tail. Frogs have glandular skin, with secretions ranging from distasteful to toxic, their skin varies in colour from well-camouflaged dappled brown and green to vivid patterns of bright red or yellow and black to show toxicity and ward off predators.
Adult frogs live on dry land. Frogs lay their eggs in water; the eggs hatch into aquatic larvae called tadpoles that have internal gills. They have specialized rasping mouth parts suitable for herbivorous, omnivorous or planktivorous diets; the life cycle is completed. A few species bypass the tadpole stage. Adult frogs have a carnivorous diet consisting of small invertebrates, but omnivorous species exist and a few feed on fruit. Frog skin has a rich microbiome, important to their health. Frogs are efficient at converting what they eat into body mass, they are an important food source for predators and part of the food web dynamics of many of the world's ecosystems. The skin is semi-permeable, making them susceptible to dehydration, so they either live in moist places or have special adaptations to deal with dry habitats. Frogs produce a wide range of vocalizations in their breeding season, exhibit many different kinds of complex behaviours to attract mates, to fend off predators and to survive.
Frogs are valued as food by humans and have many cultural roles in literature and religion. Frog populations have declined since the 1950s. More than one third of species are considered to be threatened with extinction and over 120 are believed to have become extinct since the 1980s; the number of malformations among frogs is on the rise and an emerging fungal disease, has spread around the world. Conservation biologists are working to resolve them; the use of the common names "frog" and "toad" has no taxonomic justification. From a classification perspective, all members of the order Anura are frogs, but only members of the family Bufonidae are considered "true toads"; the use of the term "frog" in common names refers to species that are aquatic or semi-aquatic and have smooth, moist skins. There are numerous exceptions to this rule; the European fire-bellied toad has a warty skin and prefers a watery habitat whereas the Panamanian golden frog is in the toad family Bufonidae and has a smooth skin.
The origin of the order name Anura — and its original spelling Anoures — is the Ancient Greek "alpha privative" prefix ἀν- "without", οὐρά, meaning "animal tail". It refers to the tailless character of these amphibians; the origins of the word frog are debated. The word is first attested in Old English as frogga, but the usual Old English word for the frog was frosc, it is agreed that the word frog is somehow related to this. Old English frosc remained in dialectal use in English as frosh and frosk into the nineteenth century, is paralleled in other Germanic languages, with examples in the modern languages including German Frosch, Icelandic froskur, Dutch vors; these words allow us to reconstruct a Common Germanic ancestor *froskaz. The third edition of the Oxford English Dictionary finds that the etymology of *froskaz is uncertain, but agrees with arguments that it could plausibly derive from a Proto-Indo-European base along the lines of *preu = "jump". How Old English frosc gave rise to frogga is, uncertain, as the development does not involve a regular sound-change.
Instead, it seems that there was a trend in Old English to coin nicknames for animals ending in -g, with examples—themselves all of uncertain etymology—including dog, pig and wig. Frog appears to have been adapted from frosc as part of this trend. Meanwhile, the word toad, first attested as Old English tādige, is unique to English and is of uncertain etymology, it is the basis for the word tadpole, first attested as Middle English taddepol meaning'toad-head'. About 88% of amphibian species are classified in the order Anura; these include over 7,000 species in 56 families, of which the Craugastoridae, Hylidae and Bufonidae are the richest in species. The Anura include any fossil species that fit within the anuran definition; the characteristics of anuran adults include: 9 or fewer presacral vertebrae, the presence of a urostyle formed of fused vertebrae, no tail, a long and forward-sloping ilium, shorter fore limbs than hind limbs and ulna fused and fibula fused, elongated an
Cambridge is a university city and the county town of Cambridgeshire, England, on the River Cam 50 miles north of London. At the United Kingdom Census 2011, its population was 123,867 including 24,506 students. Cambridge became an important trading centre during the Roman and Viking ages, there is archaeological evidence of settlement in the area as early as the Bronze Age; the first town charters were granted in the 12th century, although modern city status was not conferred until 1951. The world-renowned University of Cambridge was founded in 1209; the buildings of the university include King's College Chapel, Cavendish Laboratory, the Cambridge University Library, one of the largest legal deposit libraries in the world. The city's skyline is dominated by several college buildings, along with the spire of the Our Lady and the English Martyrs Church, the chimney of Addenbrooke's Hospital and St John's College Chapel tower. Anglia Ruskin University, which evolved from the Cambridge School of Art and the Cambridgeshire College of Arts and Technology has its main campus in the city.
Cambridge is at the heart of the high-technology Silicon Fen with industries such as software and bioscience and many start-up companies born out of the university. More than 40% of the workforce have a higher education qualification, more than twice the national average; the Cambridge Biomedical Campus, one of the largest biomedical research clusters in the world, is soon to house premises of AstraZeneca, a hotel and the relocated Papworth Hospital. The first game of association football took place at Parker's Piece; the Strawberry Fair music and arts festival and Midsummer Fair are held on Midsummer Common, the annual Cambridge Beer Festival takes place on Jesus Green. The city is adjacent to the A14 roads. Cambridge station is less than an hour from London King's Cross railway station. Settlements have existed around the Cambridge area since prehistoric times; the earliest clear evidence of occupation is the remains of a 3,500-year-old farmstead discovered at the site of Fitzwilliam College.
Archaeological evidence of occupation through the Iron Age is a settlement on Castle Hill from the 1st century BC relating to wider cultural changes occurring in southeastern Britain linked to the arrival of the Belgae. The principal Roman site is a small fort Duroliponte on Castle Hill, just northwest of the city centre around the location of the earlier British village; the fort was bounded on two sides by the lines formed by the present Mount Pleasant, continuing across Huntingdon Road into Clare Street. The eastern side followed Magrath Avenue, with the southern side running near to Chesterton Lane and Kettle's Yard before turning northwest at Honey Hill, it was converted to civilian use around 50 years later. Evidence of more widespread Roman settlement has been discovered including numerous farmsteads and a village in the Cambridge district of Newnham. Following the Roman withdrawal from Britain around 410, the location may have been abandoned by the Britons, although the site is identified as Cair Grauth listed among the 28 cities of Britain by the History of the Britons.
Evidence exists that the invading Anglo-Saxons had begun occupying the area by the end of the century. Their settlement – on and around Castle Hill – became known as Grantebrycge. Anglo-Saxon grave goods have been found in the area. During this period, Cambridge benefited from good trade links across the hard-to-travel fenlands. By the 7th century, the town was less significant and described by Bede as a "little ruined city" containing the burial site of Etheldreda. Cambridge was on the border between the East and Middle Anglian kingdoms and the settlement expanded on both sides of the river; the arrival of the Vikings was recorded in the Anglo-Saxon Chronicle in 875. Viking rule, the Danelaw, had been imposed by 878 Their vigorous trading habits caused the town to grow rapidly. During this period the centre of the town shifted from Castle Hill on the left bank of the river to the area now known as the Quayside on the right bank. After the Viking period, the Saxons enjoyed a return to power, building churches such as St Bene't's Church, merchant houses and a mint, which produced coins with the town's name abbreviated to "Grant".
In 1068, two years after his conquest of England, William of Normandy built a castle on Castle Hill. Like the rest of the newly conquered kingdom, Cambridge fell under the control of the King and his deputies; the first town charter was granted by Henry I between 1120 and 1131. It recognised the borough court; the distinctive Round Church dates from this period. In 1209, Cambridge University was founded by students escaping from hostile townspeople in Oxford; the oldest existing college, was founded in 1284. In 1349 Cambridge was affected by the Black Death. Few records survive; the town north of the river was affected being wiped out. Following further depopulation after a second national epidemic in 1361, a letter from the Bishop of Ely suggested that two parishes in Cambridge be merged as there were not enough people to fill one church. With more than a third of English clergy dying in the Black Death, four new colleges were established at the university over the following years to train new clergymen, namely Gonville Hall, Trinity Hall, Corpus Christi and Clare.
In 1382 a revised town charter effects a "diminution of the liberties that the community had enjoyed", due to Cambridge's pa
Fingerplay seen in early childhood, is hand action or movement combined with singing or spoken-words to engage the child's interest. According to Erikson, many children develop autonomy and "want to learn and imitate the activities and behavior of others". According to Wong's Essentials of Pediatric Nursing, "gestures precedes speech and in this way a child communicates satisfactorily". From all ages children become active listeners and can control their eyes and attention on the teacher; some chants or common rhymes that incorporate fingerplay include the "Itsy Bitsy Spider", "Round and round the garden", "This Little Piggy". The article entitled, "Fingerplay Fun" explains fingerplay as a form of chants or songs to gather the child's attention. Reciting chants or stories "help him develop an ear for sounds and discover that sounds can be manipulated and changed". An example of fingerplay, "Five Little Monkeys": A fingerplay is a nursery rhyme for children that uses hand movements coordinated with words to engage and sustain children's interest.
Fingerplays can be in the form of chants. Typical examples would be the "Itsy Bitsy Spider", "Round and round the garden", or "This Little Piggy". Teachers use fingerplays to introduce new concepts, they can help children develop such skills as fine motor co-ordination and following directions
A nursery rhyme is a traditional poem or song for children in Britain and many other countries, but usage of the term only dates from the late 18th/early 19th century. The term Mother Goose rhymes is interchangeable with nursery rhymes. From the mid-16th century nursery rhymes begin to be recorded in English plays, most popular rhymes date from the 17th and 18th centuries; the first English collections, Tommy Thumb's Song Book and a sequel, Tommy Thumb's Pretty Song Book, were published before 1744. Publisher John Newbery's stepson, Thomas Carnan, was the first to use the term Mother Goose for nursery rhymes when he published a compilation of English rhymes, Mother Goose's Melody, or, Sonnets for the Cradle; the oldest children's songs of which we have records are lullabies, intended to help a child fall asleep. Lullabies can be found in every human culture; the English term lullaby is thought to come from "lu, lu" or "la la" sounds made by mothers or nurses to calm children, "by by" or "bye bye", either another lulling sound or a term for good night.
Until the modern era lullabies were only recorded incidentally in written sources. The Roman nurses' lullaby, "Lalla, Lalla, aut dormi, aut lacta", is recorded in a scholium on Persius and may be the oldest to survive. Many medieval English verses associated with the birth of Jesus take the form of a lullaby, including "Lullay, my liking, my dere son, my sweting" and may be versions of contemporary lullabies. However, most of those used today date from the 17th century. For example, a well known lullaby such as "Rock-a-bye, baby on a tree top", cannot be found in records until the late-18th century when it was printed by John Newbery. A French poem, similar to "Thirty days hath September", numbering the days of the month, was recorded in the 13th century. From the Middle Ages there are records of short children's rhyming songs as marginalia. From the mid-16th century they begin to be recorded in English plays. "Pat-a-cake, pat-a-cake, baker's man" is one of the oldest surviving English nursery rhymes.
The earliest recorded version of the rhyme appears in Thomas d'Urfey's play The Campaigners from 1698. Most nursery rhymes were not written down until the 18th century, when the publishing of children's books began to move from polemic and education towards entertainment, but there is evidence for many rhymes existing before this, including "To market, to market" and "Cock a doodle doo", which date from at least the late 16th century; the first English collections, Tommy Thumb's Song Book and a sequel, Tommy Thumb's Pretty Song Book, are both thought to have been published by Mary Cooper in London before 1744, with such songs becoming known as'Tommy Thumb's songs'. John Newbery's stepson, Thomas Carnan, was the first to use the term Mother Goose for nursery rhymes when he published a compilation of English rhymes, Mother Goose's Melody, or, Sonnets for the Cradle; these rhymes seem to have come from a variety of sources, including traditional riddles, ballads, lines of Mummers' plays, drinking songs, historical events, and, it has been suggested, ancient pagan rituals.
About half of the recognised "traditional" English rhymes were known by the mid-18th century. In the early 19th century printed collections of rhymes began to spread to other countries, including Robert Chambers's Popular Rhymes of Scotland and in the United States, Mother Goose's Melodies. From this period we sometimes know the origins and authors of rhymes—for instance, in "Twinkle Twinkle Little Star" which combines the melody of an 18th-century French tune "Ah vous dirai-je, Maman" with a 19th-century English poem by Jane Taylor entitled "The Star" used as lyrics. Early folk song collectors often collected nursery rhymes, including in Scotland Sir Walter Scott and in Germany Clemens Brentano and Achim von Arnim in Des Knaben Wunderhorn; the first, the most important academic collection to focus in this area was James Orchard Halliwell's The Nursery Rhymes of England and Popular Rhymes and Tales in 1849, in which he divided rhymes into antiquities, fireside stories, game-rhymes, alphabet-rhymes, nature-rhymes and families, superstitions and nursery songs.
By the time of Sabine Baring-Gould's A Book of Nursery Songs, folklore was an academic study, full of comments and footnotes. A professional anthropologist, Andrew Lang produced The Nursery Rhyme Book in 1897; the early years of the 20th century are notable for the illustrations to children's books including Caldecott's Hey Diddle Diddle Picture Book and Arthur Rackham's Mother Goose. The definitive study of English rhymes remains the work of Peter Opie. Many nursery rhymes have been argued to have hidden origins. John Bellenden Ker, for example, wrote four volumes arguing that English nursery rhymes were written in'Low Saxon', a hypothetical early form of Dutch, he then'translated' them back into English, revealing in particular a strong tendency to anti-clericalism. Many of the ideas about the links between rhymes and historical persons, or events, can be traced back to Katherine Elwes's book The Real Personages of Mother Goose, in which she linked famous nursery-rhyme characters with real people, on little or no evidence.
She assumed that children's songs were a peculiar form of coded historical narrative, propaganda or covert protest, considered that they could have been written for entertainment. There have been several attempts, across the world. In the late 18th century we can sometimes see how rhymes like "Little Rob
The United States of America known as the United States or America, is a country composed of 50 states, a federal district, five major self-governing territories, various possessions. At 3.8 million square miles, the United States is the world's third or fourth largest country by total area and is smaller than the entire continent of Europe's 3.9 million square miles. With a population of over 327 million people, the U. S. is the third most populous country. The capital is Washington, D. C. and the largest city by population is New York City. Forty-eight states and the capital's federal district are contiguous in North America between Canada and Mexico; the State of Alaska is in the northwest corner of North America, bordered by Canada to the east and across the Bering Strait from Russia to the west. The State of Hawaii is an archipelago in the mid-Pacific Ocean; the U. S. territories are scattered about the Pacific Ocean and the Caribbean Sea, stretching across nine official time zones. The diverse geography and wildlife of the United States make it one of the world's 17 megadiverse countries.
Paleo-Indians migrated from Siberia to the North American mainland at least 12,000 years ago. European colonization began in the 16th century; the United States emerged from the thirteen British colonies established along the East Coast. Numerous disputes between Great Britain and the colonies following the French and Indian War led to the American Revolution, which began in 1775, the subsequent Declaration of Independence in 1776; the war ended in 1783 with the United States becoming the first country to gain independence from a European power. The current constitution was adopted in 1788, with the first ten amendments, collectively named the Bill of Rights, being ratified in 1791 to guarantee many fundamental civil liberties; the United States embarked on a vigorous expansion across North America throughout the 19th century, acquiring new territories, displacing Native American tribes, admitting new states until it spanned the continent by 1848. During the second half of the 19th century, the Civil War led to the abolition of slavery.
By the end of the century, the United States had extended into the Pacific Ocean, its economy, driven in large part by the Industrial Revolution, began to soar. The Spanish–American War and World War I confirmed the country's status as a global military power; the United States emerged from World War II as a global superpower, the first country to develop nuclear weapons, the only country to use them in warfare, a permanent member of the United Nations Security Council. Sweeping civil rights legislation, notably the Civil Rights Act of 1964, the Voting Rights Act of 1965 and the Fair Housing Act of 1968, outlawed discrimination based on race or color. During the Cold War, the United States and the Soviet Union competed in the Space Race, culminating with the 1969 U. S. Moon landing; the end of the Cold War and the collapse of the Soviet Union in 1991 left the United States as the world's sole superpower. The United States is the world's oldest surviving federation, it is a representative democracy.
The United States is a founding member of the United Nations, World Bank, International Monetary Fund, Organization of American States, other international organizations. The United States is a developed country, with the world's largest economy by nominal GDP and second-largest economy by PPP, accounting for a quarter of global GDP; the U. S. economy is post-industrial, characterized by the dominance of services and knowledge-based activities, although the manufacturing sector remains the second-largest in the world. The United States is the world's largest importer and the second largest exporter of goods, by value. Although its population is only 4.3% of the world total, the U. S. holds 31% of the total wealth in the world, the largest share of global wealth concentrated in a single country. Despite wide income and wealth disparities, the United States continues to rank high in measures of socioeconomic performance, including average wage, human development, per capita GDP, worker productivity.
The United States is the foremost military power in the world, making up a third of global military spending, is a leading political and scientific force internationally. In 1507, the German cartographer Martin Waldseemüller produced a world map on which he named the lands of the Western Hemisphere America in honor of the Italian explorer and cartographer Amerigo Vespucci; the first documentary evidence of the phrase "United States of America" is from a letter dated January 2, 1776, written by Stephen Moylan, Esq. to George Washington's aide-de-camp and Muster-Master General of the Continental Army, Lt. Col. Joseph Reed. Moylan expressed his wish to go "with full and ample powers from the United States of America to Spain" to seek assistance in the revolutionary war effort; the first known publication of the phrase "United States of America" was in an anonymous essay in The Virginia Gazette newspaper in Williamsburg, Virginia, on April 6, 1776. The second draft of the Articles of Confederation, prepared by John Dickinson and completed by June 17, 1776, at the latest, declared "The name of this Confederation shall be the'United States of America'".
The final version of the Articles sent to the states for ratification in late 1777 contains the sentence "The Stile of this Confederacy shall be'The United States of America'". In June 1776, Thomas Jefferson wrote the phrase "UNITED STATES OF AMERICA" in all capitalized letters in the headline of his "original Rough draught" of the Declaration of Independence; this draft of the document did not surface unti