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 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 species, P. orogensis and P. orientalis, are not pteranodontids and have been renamed Bennettazhia oregonensis and Bogolubovia orientalis respectively.

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.

Two facets of this aspect of the literary process have special significance for our time.

Two things have happened in recent months to bring the Council into perspective: each provides a basis for renewed hope and joy.

Two data centers have been established for the collection, indexing, critical evaluation, and dissemination of bibliographies and critical values in the fields of transition probabilities and collision cross sections.

Two stories will illustrate what I have in mind.

Two days before he was taken sick, Cousin Elec was out worrying about what too much rain might do to his sweetpeas, and Cousin Elec had always preserved in the top drawer of his secretary a mother-of-pearl paper knife which Theresa had coveted as a child and which he had promised she could have when he died.

Two related strands of research on altruism have emerged from traditional evolutionary analyses and from game theory.

Two works by Mauss in particular proved to have enduring relevance: Essay on the Gift, a seminal analysis of exchange and reciprocity, and his Huxley lecture on the notion of the person, the first comparative study of notions of person and selfhood cross-culturally.

Two other groups have similar inflorescences but a superior ovary, and have at times been put into separate families: the Agapanthaceae and the Alliaceae.

Two small sanctuaries, with terracotta votive offerings of Graeco-Phoenician age, lie not far off, but the location of the great shrines of Adonis and Aphrodite have not been identified ( M. Ohnefalsch-Richter, Kypros, i. ch. 1 ).

Two points in this brief description have attracted much scholarly commentary.

Two of Ammonius's students-Origen the Pagan, and Longinus-seem to have held philosophical positions which were closer to Middle Platonism than Neoplatonism, which perhaps suggests that Ammonius's doctrines were also closer to those of Middle Platonism than the Neoplatonism developed by Plotinus ( see the Enneads ), but Plotinus does not seem to have thought that he was departing in any significant way from that of his master.

Two other genera, Echinosphaerium and Camptonema, have been described but appear to be synonyms.

Two, from the Venus tablet of Ammisaduqa ( compiled in Babylon around 1700 BCE ) are reported to have been made during the reign of king Sargon of Akkad ( 2334 – 2279 BCE ).

Two theories of the direct initiation of apoptotic mechanisms in mammals have been suggested: the TNF-induced ( tumour necrosis factor ) model and the Fas-Fas ligand-mediated model, both involving receptors of the TNF receptor ( TNFR ) family coupled to extrinsic signals.

Two spiritual adversaries endeavour to tempt and corrupt humanity: these are often described through their mythological embodiments, Lucifer and his counterpart Ahriman, which have both positive and negative aspects.

Two Aegean vases were found at Sidon in 1885, and many fragments of Aegean and especially Cypriot pottery have been found during recent excavations of sites in Philistia by the Palestine Fund.

How do you do ?," Capp sardonically congratulated Lennon and Ono on their Two Virgins nude album cover: " I think that everybody owes it to the world to prove they have pubic hair.

The characters have made cameo appearances ( either visually or only voices ) and have been referenced in numerous television shows, such as Friends, Two and a Half Men, Celebrity Deathmatch, Robot Chicken, Space Ghost Coast to Coast, and Saturday Night Live ( TV Funhouse ), in films such as Airheads, Clueless, Austin Powers: International Man of Mystery and Jackass 3D, and even parodied in children shows such as Tiny Toon Adventures, Regular Show and Arthur.

Two groups of invertebrates have notably complex brains: arthropods ( insects, crustaceans, arachnids, and others ), and cephalopods ( octopuses, squids, and similar molluscs ).< ref name = Butler > The brains of arthropods and cephalopods arise from twin parallel nerve cords that extend through the body of the animal.

Two sets A and B are defined to be equal when they have precisely the same elements, that is, if every element of A is an element of B and every element of B is an element of A.

Two investigations have been held by the British government.

Two centuries ago, mummies were still believed to have medicinal properties against bleeding, and were sold as pharmaceuticals in powdered form ( see human mummy confection and mummia ).