Often the early phase, from 1. 8 to 1. 25 Ma, is considered to be a separate species, Homo ergaster, or it is seen as a subspecies of Homo erectus, Homo erectus ergaster.

Often this is accompanied by invasion by cattails, which displace many of the native plant species and reduce plant diversity.

Often, meat is used in a more restrictive sense – the flesh of mammalian species ( pigs, cattle, lambs, etc.

Often genetic and biochemical tests are necessary to confirm the discovery of a new species.

Often, advanced amateurs team up with professionals to validate their findings and ( possibly ) describe new species.

Often a hunting ground, or the hunt for one or more species, was reserved or prohibited in the context of a temple cult.

Often such species form only two spores per basidium, but that too varies.

Often, the linguistic nondifferentiation of animals not only regarded by science as different species, but that also often exist in radically different environments, is the result of culturally perceived similarities between organisms, as well as of abstract associations formed within a particular group's mythology and folklore ( see Cicada mythology ).

Often time ’ s species of Cecropia display what is called myrmecophytism as a form of biotic defense.

Often they contain rare species or nationally important species of plants, insects, butterflies, birds, mammals etc.

Often, not all the roots die: the roots of some species, notably the English elm Ulmus procera, put up suckers which flourish for approximately 15 years, after which they too succumb.

Often marked by lines and spots, they inhabit tropical and subtropical oceans throughout the world, with the greatest species richness in the Indo-Pacific.

Often such colonies include only Great Blue Herons, sometimes they nest alongside other species of herons.

Often the villains in his stories experience their downfall because of a lack of respect for other alien species or seemingly innocuous bits of their surroundings.

Often reaching enormous size — they can weigh as much as 300 kg ( 660 lbs ) and can grow to be 1. 3 m ( 4 ft ) long — they live, or lived ( some species are recently extinct ), in the Seychelles, the Mascarenes and the Galapagos.

Often known in the past as whalebirds, three species have large bills filled with lamellae that they use to filter plankton somewhat as baleen whales do, though the old name derives from their association with whales, not their bills ( though " prions " does, deriving from Ancient Greek for " saw ").

Often available through the aquarium trade, they are also a popular aquarium species in Australia.

Often called the C. lavaretus complex and considered as a superspecies, it encompasses many of the whitefish populations suggested by others to be locally restricted species ( such as the British powan and the gwyniad or the Alpine gravenche, as well as distinct intralacustrine morphs and populations characterized by different feeding habits, gill raker numbers, growth patterns and migration behaviour.

Often researchers have used the values given by one or more diversity indices to quantify species diversity.

Often head coloring helps to identify individual species.

Often it is used as a tool for creating fire breaks to reduce the risk of dangerous outbreaks but is also an important mechanism for preventing succession to woodier vegetation and plays an important role in the life cycle of heather species.

Often biostratigraphic correlations are based on a fauna, not an individual species, as this allows greater precision.

Often, a portion of the ecosystem for a particular species is simulated on a smaller scale, with controls for environmental conditions.

Often called " weathered granite ", saprolite is the result of weathering that include: hydrolysis ( the division of a mineral into acid and base pairs by the splitting of intervening water molecules ), chelation from organic compounds, hydration ( the solution of minerals in water with resulting cation, and anion pairs ), and physical processes that include freezing and thawing.

Often the quartz or the feldspar of the intergrowth extinguishes simultaneously with a crystal of either of these minerals lying in the center of the aggregate.

Often, metasomatised rocks are pervasively but weakly altered, such that the only evidence of alteration is bleaching, change in colour or change in the crystallinity of micaceous minerals.

Often they consist of aluminosilicate minerals, clays, porous glasses, microporous charcoals, zeolites, active carbons, or synthetic compounds that have open structures through which small molecules, such as nitrogen and water can diffuse.

Often, stones form when the urine becomes concentrated, allowing minerals to crystallize and stick together, which is generally caused by mild to severe dehydration concentrating the minerals as well as acids in the urine ( calcium being the most common, along with uric acid ).

Often it is recognized that all the details of the pattern may not be essential to the outcome but, because the pattern was empirically determined and not developed through theoretical understanding, one is never quite certain which behavior elements are effective, and the whole pattern becomes ritualized.

Often the historian must consider the use of intuition or instinct by those individuals or nations which he is studying.

Often work of this sort is presented as calligraphy -- the pure utterance of the brush stroke seeking only absolute painteresque values.

Often it is thin and fragile and gives way readily to the male organ at the first attempt at intercourse.

Often they are able to get in only because the area is declining economically.

Often one of the " treatments " is none, so the treatment group can act

Often the relatives plead with him not to do this, since they know they may never see the person again .</ br > Rieux works to combat the plague simply because he is a doctor and his job is to relieve human suffering.

Often, the fact that sometimes only a thin surface layer of violet color is present in the stone or that the color is not homogeneous makes for a difficult cutting.

Often it is said to be " about " long.

Often, if only one of the allophones is simple to transcribe, in the sense of not requiring diacritics, then that representation is chosen for the phoneme.

Often, if the skill is being used in a functional object, people will consider it a craft instead of art, a suggestion which is highly disputed by many Contemporary Craft thinkers.

Often the Aegis is described as the bag in which Athene carried her shield and the serpent who was her son.

Often, this is the case with a large bridge that serves as an entrance to a city, or crosses over a main harbor entrance.

Often the " small ball " model is associated with the National League, while power hitting is seen as more associated with the American League.

Often this irregular shape is due to their many centers of ossification or because they contain bony sinuses.

Often one assumes a priori that the algebra under consideration is unital: for one can develop much of the theory by considering and then applying the outcome in the original algebra.

Often, these materials are then converted into finished products, and a significant amount of value is added.

Often, a borough is a single town with its own local government.

Often that number is put at 800 million.