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...de carbon dioxide] and a source of [https://en.wikipedia.org/wiki/Hydrogen hydrogen] (as water) in the chlorophyll-containing cells (as of green [[plants]]) ex ...used hydrogen or [https://en.wikipedia.org/wiki/Hydrogen_sulfide hydrogen sulfide] as sources of [[electrons]], rather than water. Cyanobacteria appeared lat

...prokaryotes] use [https://en.wikipedia.org/wiki/Hydrogen_sulfide hydrogen sulfide] as a nutrient, yet this [[gas]] is [[poisonous]] to [[animals]]. The [[spe

...of organic compounds, although some inorganic substances, such as hydrogen sulfide and ammonia, are also odorants. The [[perception]] of an odor [[effect]] is

...erties. For example, [[water (molecule)|water]] is a compound containing [[hydrogen]] and [[oxygen]] in the ratio of two to one, with the oxygen between the hy ...m4kids.com/files/matter_changes.html] - Chemforkids.com Whereas [[hydrogen sulfide]] (H₂S) is a gas at room temperature and standard pressure, as i

...this we mean that a proton that is released by cesium becomes available to hydrogen and oxygen as deuterium (heavy water). Deuterium operates as a catalyst for ...contains a proton and a neutron. (The nucleus of protium, the more common hydrogen isotope, only contains a proton.)