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Many philosophical definitions of living systems have been proposed, such as self-organizing systems. Viruses in particular make definition difficult as they replicate only in host cells. Life exists all over the Earth in air, water, and soil, with many ecosystems forming the biosphere. Some of these are harsh environments occupied only by ...
The English word world comes from the Old English weorold.The Old English is a reflex of the Common Germanic * weraldiz, a compound of weraz 'man' and aldiz 'age', thus literally meaning roughly 'age of man'; [2] this word led to Old Frisian warld, Old Saxon werold, Old Dutch werolt, Old High German weralt, and Old Norse verǫld.
Life forms live in every part of the Earth's biosphere, including soil, hot springs, inside rocks at least 19 km (12 mi) deep underground, and at least 64 km (40 mi) high in the atmosphere. [26] [27] [28] Marine life under many forms has been found in the deepest reaches of the world ocean while much of the deep sea remains to be explored. [29]
Soil, also commonly referred to as earth, is a mixture of organic matter, minerals, gases, liquids, and organisms that together support the life of plants and soil organisms. Some scientific definitions distinguish dirt from soil by restricting the former term specifically to displaced soil.
All life on Earth can be traced back to a Last Universal Common Ancestor, or LUCA—and it likely lived on Earth only 400 million years after its formation. ... which means it was probably ...
The English language uses many Greek and Latin roots, stems, and prefixes. These roots are listed alphabetically on three pages: Greek and Latin roots from A to G; Greek and Latin roots from H to O; Greek and Latin roots from P to Z. Some of those used in medicine and medical technology are listed in the List of medical roots, suffixes and ...
However, not every definition of life considers all of these properties to be essential. Human-made analogs of life may also be considered to be life. The biosphere is the part of Earth's outer shell—including land, surface rocks, water, air and the atmosphere—within which life occurs, and which biotic processes
The following is an alphabetical list of Greek and Latin roots, stems, and prefixes commonly used in the English language from P to Z. See also the lists from A to G and from H to O . Some of those used in medicine and medical technology are not listed here but instead in the entry for List of medical roots, suffixes and prefixes .