Two species are described in the literature: A. ramidus, which lived about 4. 4 million years ago during the early Pliocene, and A. kadabba, dated to approximately 5. 6 million years ago ( late Miocene ).

Two Bacillus species are considered medically significant: B. anthracis, which causes anthrax, and B. cereus, which causes a foodborne illness similar to that of Staphylococcus.

* Two species of Malagasy Hippopotamus

Two species of hamster belonging to the genus Phodopus, Campbell's dwarf hamster ( Phodopus campbelli ) and the Djungarian hamster ( Phodopus sungorus ), and two of the genus Cricetulus, the Chinese striped hamster ( Cricetulus barabensis ) and the Chinese hamster ( Cricetulus griseus ) have a dark stripe down their heads to their tails.

Two of the three sampled species within Cricetulus represent the earliest split.

Two dwarf species, named Orcinus nanus and Orcinus glacialis, were described during the 1980s by Soviet researchers, but most cetacean researchers are skeptical about their status, and linking these directly to the types described below is difficult.

Two of his works, the first edition of the Species Plantarum ( 1753 ) for plants and the tenth edition of the Systema Naturae ( 1758 ), are accepted as among the starting points of nomenclature ; his binomials ( names for species ) and his generic names take priority over those of others.

Two kinds of lizards, the Mourning Gecko ( Lepidodactylus lugubris ) and Snake-eyed Skink ( Ablepharus boutonii ) are present on Malden, together with brown libellulid dragonfly and large colonies of Sooty Terns and other migratory seabirds ( nineteen species in all ).

Two examples are kamacite and taenite, which are found in iron meteorites ; these species differ by the amount of Ni in the alloy ; kamacite has less than 5 – 7 % nickel and it's a variety of native iron, whereas the nickel content of taenite ranges from 7 – 37 %.

* Two new fossil penguin species found in Peru

Two planarian species have been used successfully in the Philippines, Indonesia, Hawaii, New Guinea, and Guam to control populations of the imported giant African snail Achatina fulica, which was displacing native snails.

Two water molecules are oxidized by four successive charge-separation reactions by photosystem II to yield a molecule of diatomic oxygen and four hydrogen ions ; the electron yielded in each step is transferred to a redox-active tyrosine residue that then reduces the photoxidized paired-chlorophyll a species called P680 that serves as the primary ( light-driven ) electron donor in the photosystem II reaction center.

Two species of Pteranodon are traditionally recognized as valid: Pteranodon longiceps, the type species, and Pteranodon sternbergi.

Two endangered species of birds are found here: the California least tern and the California clapper rail.

Two categories are at the species level ; two, at the individual level.

* Two different species of three-spined sticklebacks in each of five different lakes

Two uteri usually form initially in a female fetus, and in placental mammals they may partially or completely fuse into a single uterus depending on the species.

Two species are currently recognized, although others have been assigned in the past.

Two other species of small turtles are the American mud turtles and musk turtles that live in an area that ranges from Canada to South America.

Two species of Hippopotamus, the European Hippopotamus ( H. antiquus ) and H. gorgops ranged throughout continental Europe and the British Isles.

Two other species, Bdellovibrio starrii and Bdellovibrio stolpii, have been moved to a separate genus Bacteriovorax.

Two submarines of the United States Navy have been named USS Tang, after the tang, or surgeonfish, especially of the several West Indian species.

( 1984 ) Two new species of Acanthocephalan Parasites of marine fishes from Bay of Bengal off Purri coast Orissa.

Sometimes used as a symbol for Christian marriage: Two gold wedding rings interlinked with the Greek letters Chi ( letter ) | chi ( X ) and Rho ( letter ) | rho ( P )— the first two letters in the Greek word for " Christ " ( see Labarum )

Although the concept of consilience in Whewell's sense was widely discussed by philosophers of science, the term was unfamiliar to the broader public until the end of the 20th century, when it was revived in Consilience: The Unity of Knowledge, a 1998 book by the humanist biologist Edward Osborne Wilson, as an attempt to bridge the culture gap between the sciences and the humanities that was the subject of C. P. Snow's The Two Cultures and the Scientific Revolution ( 1959 ).

Two Dartmouth alumni have served as justices on the Supreme Court of the United States: Salmon P. Chase and Levi Woodbury.

* James P. Hogan, The Two Faces of Tomorrow ( 1979 )

Two computers P and Q are called Turing equivalent if P can simulate Q and Q can simulate P. Thus, a Turing-complete system is one that can simulate a Turing machine ; and, per the Church-Turing thesis, that any real-world computer can be simulated by a Turing machine, it is Turing equivalent to a Turing machine.

Two Chief Justices, Salmon P. Chase and William Rehnquist, have presided over the trial in the Senate that follows an impeachment of the President – Chase in 1868 over the proceedings against President Andrew Johnson and Rehnquist in 1999 over the proceedings against President Bill Clinton.

Two weeks into the recording sessions fate struck again ; because Jan P. suffered from back problems, René was called in to play five tracks.

Two division commanders, Richard S. Ewell and A. P.

Two years later, in 1907, P. D.

Two teams of astronomers, Daniel P. Whitmire and Albert A. Jackson IV, and Marc Davis, Piet Hut, and Richard A. Muller, independently published similar hypotheses to explain Raup and Sepkoski's extinction periodicity in the same issue of the journal Nature.

* Howard, P., " Gluck " s Two Alcestes: a Comparison ", The Musical Times, cxv ( 1974 ), pp. 642 – 3.

Two bridges crossing the Mississippi River have been named for Long: Huey P. Long Bridge ( Baton Rouge ) and Huey P. Long Bridge ( Jefferson Parish ).

Two additions were made to Black Hawk, by William P. Records, Daniel A. Allen and Christopher M. Allen, May 15, 1839, consisting of sixteen lots on the north of the original town plat, and eight lots on the south.

Two other tracts containing 39 acres were sold to Gilbert Bailey, by William P. Downs and Frederick Parks in 1838.

Image: Wulff net central angle 1. jpg | Two points P < sub > 1 </ sub > and P < sub > 2 </ sub > are drawn on a transparent sheet tacked at the origin of a Wulff net.

James P. Johnson, reminiscing about Tatum's debut afterward, simply said, " When Tatum played Tea For Two that night I guess that was the first time I ever heard it really played.

* " Two Loves Have I " w. ( Eng ) J. P. Murray & Barry Trivers m. Vincent Scotto

Two years later, the Persian nationalisation of the petroleum of Iran was halted with Operation Ajax, a British – American coup d ’ état, which deposed P. M. Mossadeq on 19 August 1953, and reinstated the deposed, absolute monarchy of the Pahlavi family.

Other notable roles include Mary Elizabeth ( O ' Brien ) Sims on the Lifetime Television drama series Any Day Now ( 1998 – 2002 ), for which she was nominated for two Screen Actors Guild Award for Outstanding Performance by a Female Actor in a Drama Series, the voice of Little Bo Peep in the first two Toy Story films, a supporting role in the John Hughes's Pretty in Pink as well as guest-starring roles on such CBS's television series as Magnum, P. I., Joan of Arcadia, Close to Home, Two and a Half Men and ABC ' Men in Trees, Ugly Betty and Boston Legal.