Some unicellular species rely entirely on external energy sources and have limited or no photosynthetic apparatus.

Some sources mention the use of an abacus called a nepohualtzintzin in ancient Mayan culture.

Some sources state that At < sub > 2 </ sub > does not exist, or at least has never been observed, while other sources assert or imply its existence.

Some early sources call him their father or grandfather, but considering the commonly accepted dates of the fall of Troy ( 1184 BC ) and the founding of Rome ( 753 BC ), this seems unlikely.

Some sources state that following King Edward the Confessor's death in 1066, it was Ealdred who crowned Harold Godwinson as King of England.

Some other sources do classify him as an antipope.

Some sources record that the final blow, with the back of an axe, was delivered as an act of kindness by a Christian convert known as " Thrum.

Sources disagree, as may differing states ' laws, as to what category of plea the Alford plea falls under: Some sources state that the Alford guilty plea is a form of nolo contendere, where the defendant in the case states " no contest " to the factual matter of the case as given in the charges outlined by the prosecution.

Some sources include the requirement that the curve may not cross the line infinitely often, but this is unusual for modern authors.

Some celebrate in a way as near as possible to how the ancient Gaels did, while others observe the holiday with rituals taken from sundry unrelated sources, Gaelic culture being only one of the sources used.

Some sources say that the city may have been named after the Carthaginian general Hamilcar Barca, who was supposed to have founded the city in the 3rd century BC.

Some modern sources allude to a linguistic connection between the bunyip and Bunjil, " a mythic ' Great Man ' who made the mountains and rivers and man and all the animals.

Some incidents mentioned as having taken place within the Triangle are found only in these sources:

Some sources also add neighbouring countries ( for historical, geographical and / or cultural reasons ):

Some sources say he used it as a base for his raids on shipping, yet there is no documentary evidence for this assertion.

Some music historians argue that Chicanos of Los Angeles in the late 1970s might have independently co-founded punk rock along with the already-acknowledged founders from British-European sources when introduced to the US in major cities.

Some sources say McBride was asked for thousands of dollars in compensation from a businessman who owned the rights to the name Cleveland Panthers, an earlier failed football team.

Some early sources refer to pall mall being played over a large distance ( as in golf ), however an image in Strutt's 1801 book clearly shows a croquet-like ground billiards game ( balls on ground, hoop, bats and peg ) being played over a, garden-sized distance.

Some sources and Marker himself claim that he was born in Ulan Bator, Mongolia.

Some sources later, and even today, list his middle name erroneously as " Tecumseh ", apparently as a result of being nicknamed " The Chief " by teammates.

Some sources, including Newton, refer to the entire force as a centripetal force, even for eccentric orbits, for which gravity is not aligned with the direction to the center of curvature.

Some examples of sources ( with published dates where known ) that documented this approach are:

Some of the French dialects spoken in the French and Swiss Alps derive from Old Provençal ; the German dialects derive from Germanic tribal languages.

Some theories assume the name “ Amper ” river may derive from the Celtic word for “ water ”.

Some philosophers rely on descriptive ethics and choices made and unchallenged by a society or culture to derive categories, which typically vary by context.

Some medieval chronicles and literary works derive the name of the city of Buda from him. There is an ancient legend, amongst the Székely people that says: " After the death of Attila, in the bloody Battle of Krimhilda, 3000 Hun warriors managed to escape, to settle in a place called " Csigle mezo " ( today Transylvania ) and they changed their name from Huns to Szekler ( Szekely ).

Some scientists and philosophers reject the Naturalistic Fallacy, arguing that it is indeed possible to derive " ought " from " is ", and even that it has already been done to some extent.

Some copies of this text mention a tribe called Saxones in the area to the north of the lower River Elbe, thought to derive from the word sax or stone knife.

Some websites derive revenue by selling advertising space on their site either through direct sales or through an advertising network.

Some websites derive revenue by offering products or services for sale.

Some Western arabesques derive from Islamic art, but others are closely based on Ancient Roman decorations.

Some of Venezuela's mass media are privately operated and derive most of their revenues from advertising, subscriptions, and sale or distribution of copyrighted materials.

Some derive the word from the ancient Greek mauros, meaning " dark ".

Some modern linguists derive it and its Greek root from the Proto-Indo-European root * tel, ' to uphold, support '; others suggest that it is a pre-Indo-European name.

Some also derive nourishment from pollen, tree sap, rotting fruit, dung, decaying flesh, and dissolved minerals in wet sand or dirt.

Some neo-Nazis in Chile derive their ideology from the writings of Nicolás Palacios, while others follow an orthodox Nazi ideology influenced by Miguel Serrano and German Nazis who fled to the country after World War II.

Some chess puzzles may derive from studies which were intended to help a student of the game learn how to seal a victory, but have since evolved into an entirely separate art.

Some linguists derive the word from the Indo-Iranian root * tura-" strong, quick, sword ( Pashto )", P a s h t o turan ( thuran ) " swordsman ".

" Études Celtiques 32 ( 1996 ), 87-90 .</ ref > Some have suggested that the name may derive from " Gwenhwy-fawr " or Gwenhwy the Great, contrasting the character to " Gwenhwy-fach " or Gwenhwy the less ; Gwenhwyfach appears in Welsh literature as a sister of Gwenhwyfar, but Welsh scholars Melville Richards and Rachel Bromwich, both dismiss this etymology ( with Richards suggesting that Gwenhwyfach was a back-formation derived from an incorrect interpretation of Gwenwhy-far as Gwenhwy-fawr ).

Some derive their name from the materials they were fashioned from, such as kugi-gata ( nail form ), hari-gata ( needle form ) and tantō-gata ( knife form ); others are named after the object to which they appear similar, such as hoko-gata ( spear form ), matsuba-gata ( pine-needle form ) while others were simply named after the object that was thrown, such as kankyuto ( piercing tool form ), kunai-gata ( utility tool form ), or teppan ( plate metal ) and biao ( pin ).

Some authorities derive it from a proper name: Wiruto or Wirtino ; others from a Celtic place-name, Virolunum or Verdunum.

Some derive from English history, such as the chronicle of Mary Douglas, niece to King Henry VIII of England ( part 3, story 44 ) and Henry VIII's six wives ( part 3, story 45 ), some from Spanish history, such as Alfonso X ( part 4, story 10 ).

Some stations, for instance Droitwich in the UK, derive their carrier frequencies from an atomic clock.

Some researchers have attempted to use the methods of energy analysis, which aim to produce embodied energy estimates, to derive virtual, or embodied water estimates.

* Natural rights: Some derive the non-aggression principle by appealing to natural rights that are deemed a natural part of man.