However, there are reports of particular amphibian populations invading marine waters where their species is normally unable to survive.

However, in 2002, there is no merchant marine.

However, as the marine microbiota recovered, it is thought that increased speciation of benthic foraminifera resulted from the increase in food sources.

However, whereas in Quake, the only option was to change the color of the player's uniform unless third party modifications were used, now the game comes with a selection of three different player models: a male marine, a female marine, and a male cyborg ; choice of player model also affects the speech effects the player's character will make, such as exhaling in effort while jumping or groaning when injured.

However, microfossils such as stromatolites and oncolites prove that in shallow marine environments at least life did not suffer any perturbation.

However, this does not explain the suddenness of the extinctions in the marine realm.

However, natural gratings do occur in some invertebrate marine animals, like the antennae of seed shrimp, and have even been discovered in Burgess Shale fossils.

However, there are many more genome projects currently in progress, amongst those there are further Prochlorococcus and marine Synechococcus isolates, Acaryochloris and Prochloron, the N < sub > 2 </ sub >- fixing filamentous cyanobacteria Nodularia spumigena, Lyngbya aestuarii and Lyngbya majuscula, as well as bacteriophages infecting marine cyanobaceria.

However, it wasn't until the purchase of The Caledonia by James Watt Jr. in 1817 that they became seriously involved in the marine engineering business.

However, some inhabit freshwater environments and, with the exception of the pelagic zone, marine environments as well.

However, at about the time of Napoleonic Wars " military " began to be applied to armed forces as a whole and in the 21st century expressions like " military service ", " military intelligence " and " military history " encompass naval, marine and air force aspects.

However, according to at least one marine biologist, Nick Ruello, this advice may have arisen from an old, poorly-researched cookbook's advice regarding mussels, which has now become an assumed truism for all shellfish.

However, the earlier mass extinctions were more global and not so selective for megafauna ; i. e., many species of other types, including plants, marine invertebrates and plankton, went extinct as well.

However, a battery system would allow a hybrid marine ship with potential for high efficiency and lower emissions.

However, there are still considerable uncertainties in the marine carbon cycle, and some research suggests that a link between elevated CO < sub > 2 </ sub > and marine primary production exists .< ref > Riebesell, U., Schulz, K. G., Bellerby, R. G. J., Botros, M., Fritsche, P., Meyerhöfer, M., Neill, C., Nondal, G., Oschlies, A., Wohlers, J. and Zöllner, E. ( 2007 ).

However, a side effect of the CP was to increase marine growth.

However, as he tries to explain the situation to the marine, another teleportation test takes place and loses containment, at which point the entire Mars base is swept with an unnatural shockwave, transforming most of the base's personnel into zombies as the forces of Hell invade through the teleporter's portal.

However, when the marine catches up with Campbell in the central computer processing sector of the base, Campbell is mortally wounded and only has enough strength to say that Kelly has taken Campbell's BFG 9000 weapon before expiring.

However, the adjective marine is most commonly used for animals that live in saltwater, i. e. in oceans, seas, etc.

However, it is controversial because of the marine mammals ' need for large spaces.

However, others objecting to the continued oyster farming include famed oceanographer Sylvia Earle who has condemned those who " derive financial gain at the expense of a national treasure ," and Neal Desai of the National Parks Conservation Association, who has stated " We were promised a marine wilderness.

However, the Mobile River system has a high incidence of endemism among freshwater mollusks and biodiversity is high.

However, most freshwater cultured pearls sold today come from China.

However, due to its location among the rivers, lakes, and canals of the Yangtze Delta, locals favour freshwater produce just as much as saltwater products like crabs, oysters, and seaweed.

However, new methods of groundwater management such as artificial recharge and injection of surface waters during seasonal wet periods has extended the life of many freshwater aquifers, especially in the United States.

However, using the example of the freshwater amoeboid Paulinella chromatophora, which contains chromatophores found to be evolved from cyanobacteria, these authors argue that this is not the only possible criterion, another one being that the host cell has assumed control of the regulation of the former endosymbiont's division, bringing it in synchrony with the cell's own division.

The most widely accepted definition is: “ a semi-enclosed coastal body of water, which has a free connection with the open sea, and within sea water is measurably diluted with freshwater derived from land drainage .” However, this definition excludes a number of coastal water bodies such as coastal lagoons and brackish seas.

However, seashells are not the only kind of shells ; in various habitats it is possible to find shells from freshwater animals such as freshwater mussels and freshwater snails, and it is also possible to find the shells of land snails.

However, saltwater fish can also be caught with " poppers ," and other surface lure similar to those used for freshwater bass fishing, though much larger.

However, some species have evolved purely freshwater existences, such as the lake sturgeon ( Acipenser fulvescens ) and the Baikal sturgeon ( A. baerii baicalensis ), or have been forced into them by anthropogenic or natural impoundment of their native rivers, as in the case of some subpopulations of white sturgeon ( A. transmontanus ) in the Columbia River and Siberian sturgeon ( A. baerii ) in the Ob basin.

However, bull sharks in freshwater possess several organs with which to maintain appropriate salt and water balance ; these are the rectal gland, kidneys, liver and gills.

However, even on these islands, it tends to favor freshwater marshes.

However, there are some indications that in contrast to Murray cod larvae, eastern freshwater cod larvae may not drift in river currents for several days after leaving their nest.

However, some freshwater populations and populations at extreme latitudes can reach maturity in only 1 year.

However, even where large areas of suitable habitat remain, subtle habitat alterations can be a problem, such as in the Andaman Islands, where freshwater areas, used for nesting, are being increasingly converted for human agriculture.

However, in 1910 a dam was constructed at Craigie's Bridge, closing the Charles River estuary to the ocean tides and forming a body of freshwater above the dam.

However, while visitors can see the wolves from this room, the principal exhibits are the Canadian Beaver habitat, a freshwater pond and a Bald Eagle.

However, the inhabitants of saltwater aquariums are usually much more spectacular than freshwater aquarium fish.

However, there are indications that during the last deglaciation ( 17, 500 years ago ), the rapid melting of the northernmost extension of the Patagonian Ice Sheet resulted in a dramatic release of freshwater to the adjacent ocean, decreasing its salinity and altering its circulation, resulting in significant ecological changes both locally and remotely.

However, some of the youngest known specimens of Hesperornis have been found in inland freshwater deposits of the Foremost Formation, suggesting that some species of Hesperornis may have eventually moved, at least partially, away from a primarily marine habitat.

However, fish of the same species have been found in coastal sea waters, brackish swamps and freshwater streams, living and breeding.

However, the temperature of maximum density for freshwater is 4 ° C.