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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.
Facultative anaerobes can grow with or without oxygen because they can metabolize energy aerobically or anaerobically. They gather mostly at the top because aerobic respiration generates more adenosine triphosphate (ATP) than either fermentation or anaerobic respiration. Microaerophiles need oxygen because they cannot ferment or respire ...
Henneguya zschokkei is found in fish as an ovoid spore with two anterior polar capsules and two long caudal appendages. [6] Individuals are very small (about 10 micrometers in diameter), [7] but are found aggregated into cysts 3–6 mm in diameter at any place in the animal's musculature.
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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 ...
The newly reported animals complete their life cycle in the total absence of light and oxygen, and they are less than a millimetre in size. [19] They were collected from a deep basin at the bottom of the Mediterranean Sea, where they inhabit a nearly salt-saturated brine that, because of its density (> 1.2 g/cm 3 ), does not mix with the waters ...
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 ...