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

However, these populations are believed to be small, fragmented and vulnerable to extinction.

However, some local populations are classified as Endangered, and some subspecies are endangered or extinct.

However widespread agricultural use led to resistant insect populations.

However, in the mid-19th century, the inhabitants of many parts of the Hebrides were devastated by the clearances, which destroyed communities throughout the Highlands and Islands as the human populations were evicted and replaced with sheep farms.

However, Augustine was not a resident of the Holy Land and therefore was not familiar with the local populations and their oral traditions.

However, there are still populations of asteroids temporarily present in or near these resonances.

However, as there is considerable variation of this character and there were no other differences between these birds and adjacent populations of S. c. camelus, the separation is no longer considered valid.

However, due to the lower population density and better hygiene ( widespread practicing of banya, the wet steam bath ), the population loss caused by plagues was not so severe as in the Western Europe, and the pre-Plague populations were reached in Russia as early as 1500.

However, in large, disorganized populations simply constructing a suitable sample frame is often a complex and expensive task.

However, swords were still used in combat, especially in Colonial Wars between native populations and Colonial Empires.

However, the heterozygous advantage hypothesis was proposed in one review in which the author himself writes, " Although cellular / molecular evidence presently is not available for this hypothesis, the CF mutation may be one of several mutations that have spread in European populations because they increased resistance to infectious diseases.

However, the Supreme Court has interpreted the provision of Clause One that Representatives shall be elected " by the People " to mean that, in those states with more than one member of the House of Representatives, each congressional election district within the state must have nearly identical populations.

However, many wildebeest populations are experiencing rapid declines.

However, cultural assimilation of Veddas with other local populations has been going on for a long time.

However, various anthropogenic factors have had a severe impact on zebra populations, in particular hunting for skins and habitat destruction.

However, populations of several species are restricted to fresh water through their lives.

However, adequate forest or brush cover must still be provided for populations to grow and thrive.

However, many national parks and protected reserves in Europe do have populations of red deer, roe deer, and fallow deer.

However, too frequent bushfires can seriously reduce or even eliminate populations from certain areas, by killing seedlings and young plants before they reach fruiting age.

However, their populations are not growing as fast as the U. S., which supplements a high immigration rate with one of the highest birthrates among Western countries.

However, the view that selection on other levels, such as organisms and populations, seldom opposes selection on genes is more controversial.

However, since many of these distinct populations show no significant genetic differences, what may appear to be a large number of species is considered a much smaller number of distinct species by most ichthyologists.

However, dozens of formerly thriving cities, especially in the Western Empire, had been ruined, their populations dispersed and, with the breakdown of the economic system, could not be rebuilt.

However, such encapsulation tends to prevent immune cells from attacking bacteria in the pus, or from reaching the causative organism or foreign object.

However, this argument does not necessarily apply to bacteria.

However, some bacteria such as Clostridium botulinum or Bacillus cereus, can form spores that survive cooking, which then germinate and regrow after the food has cooled.

However, more specifically, the relationship was endosymbiotic, meaning that one of the organisms ( the bacteria ) lived within the other ( the eukaryotic cells ).

However, this view neglects the fact that i ) both modern cyanobacteria and alpha-proteobacteria are Gram negative bacteria, which are surrounded by double membranes ; ii ) the outer membranes of the endosymbiotic organelles ( chloroplasts and mitochondria ) are very similar to those of these bacteria in their lipid and protein compositions.

However, this has proven more difficult than modifying bacteria, primarily because of the problems involved in carrying large sections of DNA and delivering them to the correct site on the gene.

However, once the DNA was inserted, it did not remain in the cytoplasm of the bacterial cell but was incorporated into the bacteria in some fashion ( later determined to be inserted into bacterial DNA ).

However, honey sometimes contains dormant endospores of the bacterium Clostridium botulinum, which can be dangerous to infants, as the endospores can transform into toxin-producing bacteria in the infant's immature intestinal tract, leading to illness and even death ( see Health hazards below ).

However, in 1990 the microbiologist Carl Woese proposed the three-domain system that divided living things into bacteria, archaea and eukaryotes.

However, raw milk can become contaminated in a number of ways: by coming into contact with cow feces or bacteria living on the skin of cows, from an infection of the cow's udder, or from dirty equipment, among others.

However, some bacteria, for example Myxococcus xanthus, exhibit gliding motility.

However, if the immune system or " good " microbiota are damaged in any way ( such as by chemotherapy, human immunodeficiency virus ( HIV ), or antibiotics being taken to kill other pathogens ), pathogenic bacteria that were being held at bay can proliferate and cause harm to the host.

However, there are some types of bacteria that carry out anoxygenic photosynthesis, which consumes carbon dioxide but does not release oxygen.

However the bacteria which causes deadly botulism, Clostridium botulinum, is widespread and can survive boiling and will multiply in certain foods at room temperatures in a sealed container.

However, bacteria lacking antigen F1 are still virulent, and the V antigens are sufficiently variable, such that vaccines composed of these antigens may not be fully protective.

However, the walls are naturally porous and only act as stiff shells that protect bacteria from severe environmental impacts.

However, infants and young children are much more susceptible to infection, easily achieved by ingesting a small number of bacteria.

However, the total live biomass of bacteria may exceed that of plants and animals.

However, in all cases where infection with β-lactamase-producing bacteria is suspected, the choice of a suitable β-lactam antibiotic should be carefully considered prior to treatment.

However, some bacteria are developing antibiotic resistance, particularly Shigella.

However, the externalities with these farms include " contributing to the increase in the pool of antibiotic-resistant bacteria because of the overuse of antibiotics ; air quality problems ; the contamination of rivers, streams, and coastal waters with concentrated animal waste ; animal welfare problems, mainly as a result of the extremely close quarters in which the animals are housed.

However, they do not consume all their feces indiscriminately, but produce special soft pellets, called cecotropes, which recycle B vitamins, fiber, and bacteria required for proper digestion.

However, large numbers of bacteria are found within the sediment which have a very high oxygen demand.