They also have an operculum, which helps them breathe without having to swim.

They are learned how to roll-back-to-float ( hold their breath underwater, to roll onto their back, to float unassisted, rest and breathe until help arrives ).

Slaves cannot breathe in England ; if their lungs receive our air, that moment they are free, They touch our country, and their shackles fall.

They breathe through feather-like gills and are found in bodies of water that do not freeze to the bottom ; they are also mostly found in brooks and streams where there is fresh water running, and which have shelter against predators.

They breathe through five to seven gill slits.

They can go six minutes without breathing ( though about two and a half minutes is more typical ), and have been known to rest on their tail to breathe with their heads above water.

They make way for Astaire who strides confidently to the front of the stage and delivers the song, which features the famous line: " I'm stepping out, my dear, to breathe an atmosphere that simply reeks with class ," trading the occasional tap barrage with the chorus as he sings. The dance begins with Astaire and chorus moving in step.

They breathe through spiracles, a trait they share with the insects.

They do not have book lungs, and breathe through tracheae.

They land and discover that they can breathe the air, drink the water, and eat the local vegetation.

They breathe through tracheae, stigmata ( small openings of the skin ), intestines and the skin itself.

They breathe the fervour of an island patriotism ( humorously aware of its limits ) and of a simple natural piety.

They are obligate air-breathers, requiring access to surface air to breathe in poorly oxygenated water.

They are rescued by Titan's slave girl Marina ( modelled on Brigitte Bardot ), a beautiful mute young woman who can breathe underwater.

They can breathe in water as easily as in air, and need far less oxygen than humans.

They breathe through gills, which they periodically wet with seawater.

They are able to survive for extended periods on land through a combination of behavioral and physiological adaptations, including pectoral fins that act as simple legs ; the ability to breathe through their skins ( like frogs ); and the digging of damp burrows to avoid drying out.

They breathe air more frequently and more noisily than normal, possibly reflecting a greater physiological requirement for oxygen.

They collect air under their elytra and are able to breathe this collected air using spiracles hidden under the elytra.

They breathe through the corners of their mouths.

They breathe through the skin.

They breathe an earthlike atmosphere, and their throats are unable to speak English without surgical modification.

They appear to be unable to survive in atmospheres that support human life ; they are often seen wearing armored life-support systems that provide them with the methane they need to breathe.

" They described it as " a complex novel of many layers people live and breathe and die horribly in pages.

They are chemically resistant and require high temperature to react even with oxygen.

They also protect plant tissues by helping to absorb the energy from singlet oxygen, an excited form of the oxygen molecule O < sub > 2 </ sub > which is formed during photosynthesis.

They surface periodically to exhale carbon dioxide and inhale a fresh supply of oxygen.

They proved by their experiments that a group of carbon, hydrogen, and oxygen atoms can behave like an element, take the place of an element, and can be exchanged for elements in chemical compounds.

They require little maintenance and electricity, provide a constant source of oxygen, and eliminate the expensive, and often dangerous, task of transporting oxygen cylinders to remote areas.

They are bound at three oxygen sites, which gives a characteristic silicon: oxygen ratio of 2: 5.

They can be further subdivided by the ratio of oxygen to the cations.

They have higher acidities due to the aromatic ring's tight coupling with the oxygen and a relatively loose bond between the oxygen and hydrogen.

They suppress the release of cytokines and other inflammatory signals, and inhibit the production of reactive oxygen species.

They are carbohydrates and as this name implies, are composed of carbon, hydrogen and oxygen.

Flux and slag can provide a secondary service after the reduction step is complete: They provide a molten cover on the purified metal, preventing it from coming into contact with oxygen while it is still hot enough to oxidise readily.

They also discovered that water is formed by two parts of hydrogen and one part of oxygen ( by volume ).

They use the nitrate as an electron acceptor in the place of oxygen during respiration.

They exhibit broad emission line spectra with helium, nitrogen, carbon and oxygen lines.

They have high gas permeability: at room temperature ( 25 ° C ), the permeability of silicone rubber for such gases as oxygen is approximately 400 times that of butyl rubber, making silicone useful for medical applications in which increased aeration is desired.

They take up oxygen in the lungs or gills and release it while squeezing through the body's capillaries.

They reached a height of 7016 metres ( 23, 000 feet ), quite dangerous without on board oxygen.

They are used to extract nitrogen from air to increase oxygen content for both industrial and medical purposes.

They require oxygen but at a low concentration.

They require oxygen but at a low concentration.

They are second only to hemoglobin in frequency of use as an oxygen transport molecule.