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A planet without any water can have oceans brought back if hit by an "ice meteor" (a.k.a. a comet). Many things have to be kept within a certain balanced range for a planet to be able to support multicellular animal life; outside this range, only single-celled lifeforms, plants, robots, and lifeforms that have been civilized can survive.
It afflicts several salmon in the genera Oncorhynchus and Salmo, [2] [3] where it causes milky flesh or tapioca disease. [1] H. zschokkei does not require oxygen to survive and is notable for being one of the few multicellular organisms in the animal kingdom to rely on an exclusively anaerobic metabolism.
It may react negatively or even die if free oxygen is present. In contrast, an aerobic organism (aerobe) is an organism that requires an oxygenated environment. Anaerobes may be unicellular (e.g. protozoans, [1] bacteria [2]) or multicellular. [3] Most fungi are obligate aerobes, requiring oxygen to survive.
Mycoplasma species (like the other species of the class Mollicutes) are among the smallest organisms yet discovered, [2] can survive without oxygen, and come in various shapes. For example, M. genitalium is flask-shaped (about 300 x 600 nm ), while M. pneumoniae is more elongated (about 100 x 1000 nm ), many Mycoplasma species are coccoid .
The Rare Earth hypothesis argues that planets with complex life, like Earth, are exceptionally rare.. In planetary astronomy and astrobiology, the Rare Earth hypothesis argues that the origin of life and the evolution of biological complexity, such as sexually reproducing, multicellular organisms on Earth, and subsequently human intelligence, required an improbable combination of astrophysical ...
Lifeless Planet is a 2014 puzzle adventure developed by independent American company Stage 2 Studios and published by Serenity Forge. The game was released on June 6, 2014 for Microsoft Windows and on June 23, 2014 for OS X, and has been ported to the Xbox One on May 13, 2015, Linux on March 25, 2016 and to the PlayStation 4 on July 19, 2016.
A life form (also spelled life-form or lifeform) is an entity that is living, [1] [2] such as plants , animals , and fungi . It is estimated that more than 99% of all species that ever existed on Earth, amounting to over five billion species, [3] are extinct. [4] [5] Earth is the only celestial body known to harbor life forms. No form of ...
Microbial mats use all of the types of metabolism and feeding strategy that have evolved on Earth—anoxygenic and oxygenic photosynthesis; anaerobic and aerobic chemotrophy (using chemicals rather than sunshine as a source of energy); organic and inorganic respiration and fermentation (i..e converting food into energy with and without using ...