Because the osteoclasts are derived from a monocyte stem-cell lineage, they are equipped with phagocytic-like mechanisms similar to circulating macrophages.

Because osteoclasts are also macrophages, this protein plays an active role in production and activation of osteoclasts and bone reabsorbtion.

Because they need sunlight, they inhabit the upper, sunlit epipelagic zone, which includes the coastal or neritic zone.

Because parasitic organisms often inhabit multiple hosts during a life cycle, evolutionary biologist Ernst Mayr stated that internal parasites existing within different hosts demonstrate allopatry, not sympatry.

Because they inhabit the higher reaches of the arid Himalayas, they depend on glacial runoff for irrigatation their crops.

Because of its apparent barrenness and the past inability to cultivate the land of the island, local lore dictates that evil spirits inhabit it which prevent its being populated.

Because electrical forces ( the charge-excess ) are far more powerful than gravitation, the surface hydrogen atoms would shoot away from the sphere.

Because of the delay, Young and Duke began their descent to the surface at an altitude higher than that of any previous mission, at.

Because of this property, the collapsed stars were called " frozen stars ," because an outside observer would see the surface of the star frozen in time at the instant where its collapse takes it inside the Schwarzschild radius.

Because water is incompressible and must remain within the confines of the bucket, this outward movement increases the depth of water at the larger radius, increasing the height of the surface at larger radius, and lowering it at smaller radius.

Because the surface of laterite is uneven, it was not suitable for decorative carvings, unless first dressed with stucco.

Because the porosity of the surface soil results in virtually zero runoff, lenses are easily polluted by fecal waste, burials, and chemical spills.

Because such waves conserve the amount of energy they transmit through any spherical boundary surface drawn around their source, and because such surfaces have an area that is defined by the square of the distance from the source, the power of EM radiation always varies according to an inverse-square law.

Because the reflected and incident waves propagate in the same medium and make the same angle with the normal to the surface, the amplitude reflection coefficient is related to the reflectance R by

Because of the large influx of fresh water from rivers, especially from the Neva River ( two thirds of the total runoff ), the gulf water has very low salinity – between 0. 2 and 5. 8 ‰ at the surface and 0. 3 – 8. 5 ‰ near the bottom.

Because it is warm, the surface radiates far IR thermal radiation that consists of wavelengths that are predominantly much longer than the wavelengths that were absorbed ( the overlap between the incident solar spectrum and the terrestrial thermal spectrum is small enough to be neglected for most purposes ).

Because the Earth is much heavier than the Moon, the barycenter is located within the Earth ( about below the surface ).

Because of the large surface area to volume ratio of MEMS, surface effects such as electrostatics and wetting dominate over volume effects such as inertia or thermal mass.

Because of suggestions ( later proven false ) of Plaisted's use of air transport, some sources classify Herbert's expedition as the first confirmed to reach the North Pole over the ice surface by any means.

Because obsidian is metastable at the Earth's surface ( over time the glass becomes fine-grained mineral crystals ), no obsidian has been found that is older than Cretaceous age.

Because of the size of Olympus Mons and its shallow slopes, an observer standing on the Martian surface would be unable to view the entire profile of the volcano, even from a great distance.

Because the pressure is lower at the surface than underground, some of the gas will come out of solution and be recovered ( or burned ) as associated gas or solution gas.

Because of the seasonal overflow of the numerous westward-flowing streams, the lowland areas of the Paraneña region also experience poor drainage conditions, particularly in the Ñeembucú Plain in the southwest, where an almost impervious clay subsurface prevents the absorption of excess surface water into the aquifer.

Because it did not grow in a pearl oyster it is not pearly ; instead the surface is glossy like porcelain.

Because daguerreotypes were rendered on a mirrored surface, many spiritualists also became practitioners of the new art form.

Because, on the surface, the organization of the state had been preserved by the first emperors without significant alteration.

Because the blade surface looks down, most of the scattered molecules will leave it downwards.

Because of its low surface brightness, low power is required.

Because so many variables are involved, it is important to be able to overlay the many layers of data to develop a full and accurate portrayal of what is taking place on the Earth's surface.

Because of this, birds usually have a smaller number of bones than other terrestrial vertebrates.

Because bones come in a variety of shapes and have a complex internal and external structure they are lightweight, yet strong and hard, in addition to fulfilling their many other functions.

Because no postcranial remains ( bones below the skull ) have been discovered, it is as of yet unknown whether Sahelanthropus tchadensis was indeed bipedal or two-footed, although claims for an anteriorly placed foramen magnum suggests that this may have been the case, some paleontologists have disputed this interpretation of the basicranium.

Because desmostylians were originally known only from skull fragments, teeth and bits of other bones, general agreement was that they had had flippers and a fin-like tail.

Because the left aortic arch goes directly to the gut, the shunting of oxygen depleted blood which is high in CO < sub > 2 </ sub > may serve to aid in creating stomach acid to assist in digesting bones from its prey.

Because of this, my heart breaks within me, and my bones tremble ; for even the day of death does not atone for such sins.

Because of this the correctness of the original age estimates were repeatedly called into question ,< ref > Aldred, C., < cite > Akhenaten, King of Egypt </ cite > ( Thames and Hudson, 1988 ) p. 202 </ ref >< ref > Reeves, C. N., < cite > The Valley of the Kings </ cite > ( Kegan Paul, 1990 ) p. 49 </ ref >< ref > Bell, M. R., < cite >" An Armchair Excavation of KV 55 ", JARCE 27 ( 1990 )</ cite > pp. 135 </ ref > and prior to the genetic tests done in early 2010, several professional opinions were made suggesting a much later age for the skeletal remains, pointing to an age of about 35 years based on dentition or even later ( based on anthropological standards and more-recent X-rays of the long bones ).< ref > Reeves, C. N, < cite > Akhenaten, Egypt's False Prophet </ cite > ( Thames and Hudson, 2001 ) p. 84 </ ref > It must be remembered that it is very difficult to date a mummy's age, and there are many differing opinions on the legitimacy of dating techniques.

Incidentally, Kepler used another one of Napier's inventions for his calculations ( much more appropriate for computing planets ' orbits than his Napier's bones ): the logarithm tables ; Because of this, Kepler dedicated his Ephemeris to John Napier.

Because an individual's nutrition can affect bone structure, a physiological age is estimated based on the state of the bones.

Because turtle shells as well as bones were used, the oracle bone script is also sometimes called shell and bone script.

Because of the acidity of peat, however, bones are dissolved rather than preserved.

Because of Gankutsuou, he is afflicted with an odd condition which causes his body to be crystalline, revealing his bones and internal organs.

Because of the massive accumulations of fossil bones of this animal, particularly at Agate Springs Nebraska, Menoceras may have lived in large herds.

Because the swelling is subperiosteal its boundaries are limited by the individual bones, in contrast to a chignon.

Because of their rich blood supply, metaphysis of long bones are prone to hematogenous spread of osteomyelitis in children.

Because the lead isotopes are created by decay of different transuranic elements, the ratios of the four lead isotopes to one another can be very useful in tracking the source of melts in igneous rocks, the source of sediments and even the origin of people via isotopic fingerprinting of their teeth, skin and bones.

Because of their elevated charcoal content and the common presence of pottery remains, it is now widely accepted that these soils accreted near living quarters as residues from food preparation, cooking fires, animal and fish bones, broken pottery, etc., accumulated.