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An ecosystem consists of all the organisms and the physical environment with which they interact. These biotic and abiotic components are linked together through nutrient cycles and energy flows. Energy enters the system through photosynthesis and is incorporated into plant tissue. By feeding on plants and on one another, animals play an important role in the movement of matter and energy through the system. They also influence the quantity of plant and microbial biomass present. By breaking down dead organic matter, decomposers release carbon back to the atmosphere and facilitate nutrient cycling by converting nutrients stored in dead biomass back to a form that can be readily used by plants and microbes.
The timeline of the evolutionary history of life represents the current scientific theory outlining the major events during the development of life on planet Earth. Dates in this article are consensus estimates based on scientific evidence, mainly fossils.
The geologic time scale, or geological time scale, (GTS) is a representation of time based on the rock record of Earth. It is a system of chronological dating that uses chronostratigraphy and geochronology. It is used primarily by Earth scientists to describe the timing and relationships of events in geologic history. The time scale has been developed through the study of rock layers and the observation of their relationships and identifying features such as lithologies, paleomagnetic properties, and fossils. The definition of standardized international units of geologic time is the responsibility of the International Commission on Stratigraphy (ICS), a constituent body of the International Union of Geological Sciences (IUGS), whose primary objective is to precisely define global chronostratigraphic units of the International Chronostratigraphic Chart (ICC) that are used to define divisions of geologic time. The chronostratigraphic divisions are in turn used to define geochronologic units.
The Tennessee Valley Authority (TVA) is a federally owned electric utility corporation in the United States. TVA's service area covers all of Tennessee, portions of Alabama, Mississippi, and Kentucky, and small areas of Georgia, North Carolina, and Virginia. While owned by the federal government, TVA receives no taxpayer funding and operates similarly to a private for-profit company. It is headquartered in Knoxville, Tennessee, and is the sixth largest power supplier and largest public utility in the country.
The judiciary is the system of courts that adjudicates legal disputes/disagreements and interprets, defends, and applies the law in legal cases.
Mayahuel is the female deity associated with the maguey plant among cultures of central Mexico in the Postclassic era of pre-Columbian Mesoamerican chronology, and in particular of the Aztec cultures. As the personification of the maguey plant, Mayahuel is also part of a complex of interrelated maternal and fertility goddesses in Aztec religion and is also connected with notions of fecundity and nourishment.
The Araliaceae are a family of flowering plants composed of about 43 genera and around 1500 species consisting of primarily woody plants and some herbaceous plants. The morphology of Araliaceae varies widely, but it is predominantly distinguishable based on its woody habit, tropical distribution, and the presence of simple umbels.
Bushehr, Booshehr or Bushire, also known as Bandar Bushehr, previously Antiochia in Persis and Bukht Ardashir, is the capital city of Bushehr Province, Iran and a port city in south of Iran. At the 2006 census, its population was 161,674, in 40,771 families.
Keelung or Jilong, officially known as Keelung City, is a major port city situated in the northeastern part of Taiwan. The city is a part of the Taipei–Keelung metropolitan area, along with the neibouring New Taipei City and Taipei. Nicknamed the Rainy Port for its frequent rain and maritime role, the city is Taiwan's second largest seaport . The city was founded by the Spanish Empire in 1626, called La Santisima Trinidad.
Paleobotany, which is also spelled as palaeobotany, is the branch of botany dealing with the recovery and identification of plant remains from geological contexts, and their use for the biological reconstruction of past environments (paleogeography), and the evolutionary history of plants, with a bearing upon the evolution of life in general. A synonym is paleophytology. It is a component of paleontology and paleobiology. The prefix palaeo- means "ancient, old", and is derived from the Greek adjective παλαιός, palaios. Paleobotany includes the study of terrestrial plant fossils, as well as the study of prehistoric marine photoautotrophs, such as photosynthetic algae, seaweeds or kelp. A closely related field is palynology, which is the study of fossilized and extant spores and pollen.
Ribes is a genus of about 200 known species of flowering plants, most of them native to the temperate regions of the Northern Hemisphere. The various species are known as currants or gooseberries, and some are cultivated for their edible fruit or as ornamental plants. Ribes is the only genus in the family Grossulariaceae.
Process engineering is the understanding and application of the fundamental principles and laws of nature that allow humans to transform raw material and energy into products that are useful to society, at an industrial level. By taking advantage of the driving forces of nature such as pressure, temperature and concentration gradients, as well as the law of conservation of mass, process engineers can develop methods to synthesize and purify large quantities of desired chemical products. Process engineering focuses on the design, operation, control, optimization and intensification of chemical, physical, and biological processes. Process engineering encompasses a vast range of industries, such as agriculture, automotive, biotechnical, chemical, food, material development, mining, nuclear, petrochemical, pharmaceutical, and software development. The application of systematic computer-based methods to process engineering is "process systems engineering".
A houseplant, sometimes known as a pot plant, potted plant, or an indoor plant, is an ornamental plant that is grown indoors. As such, they are found in places like residences and offices, mainly for decorative purposes. Common houseplants are usually tropical or semi-tropical, and are often epiphytes, succulents or cacti.
Jōō (貞応), also romanized as Jō-ō, was a Japanese era name after Jōkyū and before Gennin. This period spanned the years from April 1222 to November 1224. The reigning emperor was Go-Horikawa-tennō.
John Earl Haynes is an American historian who worked as a specialist in 20th-century political history in the Manuscript Division of the Library of Congress. He is known for his books on the subject of the American Communist and anti-Communist movements, and on Soviet espionage in America.
Archaeoceratops, meaning "ancient horned face", is a genus of basal neoceratopsian dinosaur from the Early Cretaceous of north central China. It appears to have been bipedal and quite small, reaching 0.9 m (3.0 ft) in length and 10 kg (22 lb) in body mass. It had a comparatively large head but no horns, possessing only a small bony frill projecting from the back of its head.
Kanpō (寛保) was a Japanese era name, also known as Kampō, after Genbun and before Enkyō. This period spanned the years from February 1741 through February 1744. The reigning emperor was Sakuramachi-tennō (桜町天皇).
Jōwa (承和) was a Japanese era name after Tenchō and before Kashō. This period spanned the years from January 834 through July 848. The reigning emperors were Junna-tennō (淳和天皇) and Ninmyō-tennō (仁明天皇).
In reproductive biology, a hermaphrodite is an organism that has both kinds of reproductive organs and can produce both gametes associated with male and female sexes.
Professor Gidon Eshel is an American oceanography, climatology, and geophysics academic best known for his quantification of the "geophysical consequences of agriculture and diet". As of 2017, he is research professor at Bard College in New York.
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