Developmental biologists study the process of development and growth of organisms Biochemists study the chemical composition of living things, they analyze the complex chemical combinations and reactions involved in metabolism and growth.
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Molecular biologists study the biological activity between biomolecules. Microbiologists investigate the growth and characteristics of microscopic organisms such as bacteria , algae , or fungi. Physiologists study life functions of plants and animals, in the whole organism and at the cellular or molecular level, under normal and abnormal conditions.
Physiologists specialize in functions such as growth, photosynthesis , respiration , or movement, or in the physiology of a certain area or system of the organism. Biophysicists use experimental methods traditionally employed in physics to answer biological questions. Computational Biologists apply the techniques of computer science, applied mathematics and statistics to address biological problems. Pond A pond is an area filled with water, either natural or artificial, smaller than a lake.
It may arise in floodplains as part of a river system, or be a somewhat isolated depression, it may contain shallow water with marsh and aquatic animals. Factors impacting the type of life found in a pond include depth and duration of water level, nutrient level, presence or absence of inlets and outlets, effects of grazing animals, salinity. Ponds are man-made, or expanded beyond their original depth and bounds.
Among their many uses, ponds provide water for agriculture and livestock , aid in habitat restoration, serve as fish hatcheries , are components of landscape architecture, may store thermal energy as solar ponds, treat wastewater as treatment ponds. Ponds are characteristically categorized separately from flowing watercourses such as brooks, streams or rivers. Ponds may be saltwater, or brackish ; the technical distinction between a pond and a lake has not been universally standardized.
Limnologists and freshwater biologists have proposed formal definitions for pond, in part to include'bodies of water where light penetrates to the bottom of the waterbody,"bodies of water shallow enough for rooted water plants to grow throughout,' and'bodies of water which lack wave action on the shoreline. Each of these definitions has met with resistance or disapproval, as the defining characteristics are each difficult to measure or verify. Accordingly, some organizations and researchers have settled on technical definitions of pond and lake that rely on size alone.
Among organizations and researchers who distinguish lakes from ponds by size alone, there is no universally recognised standard for the maximum size of a pond; the international Ramsar wetland convention sets the upper limit for pond size as 8 hectares, but biologists have not universally adopted this convention. Researchers for the British charity Pond Conservation have defined a pond to be'a man-made or natural waterbody, between 1 m2 and 20, m2 in area, which holds water for four months of the year or more. In practice, a body of water is called a pond or a lake on an individual basis, as conventions change from place to place and over time.
In North America larger bodies of water have been called ponds. There are numerous examples in other states, where bodies of water less than 10 acres are being called lakes. As the case of Crystal Lake shows, marketing purposes can sometimes be the driving factor behind the categorization. Ponds can result from a wide range of natural processes. Any depression in the ground which collects and retains a sufficient amount of precipitation can be considered a pond, such depressions can be formed by a variety of geological and ecological events.see url
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Rivers leave behind ponds in natural floodplains after spring flooding, these can be important to breeding fish in large river systems like the Amazon. Retreating glaciers can leave behind landscapes filled with small depressions, each developing its own pond. Many areas of landscape contain small depressions which form temporary ponds after spring snow melts, or during rainy seasons; some ponds are created by animals.
Beaver ponds are the best-known example, but alligators excavate ponds as well. In landscapes with organic soils, fires can create depressions during periods of drought. Familiar examples might include water-lilies, frogs and herons; the entire margin of the pond is fringed by wetland, these wetlands support the aquatic food web, provide shelter for wildlife, stabilize the shore of the pond. Some grazing animals like geese and muskrats consume the wetland plants directly as a source of food. In many other cases, the pond plants fall into the water and decay.
A large number of invertebrates feed on the decaying plants, these invertebrates provide food for wetland species including fish and herons; the open water may allow algae to grow, these algae may support yet another food web that includes aquatic insects and minnows. A pond, may have combinations of three different food webs, one based on larger plants, one based upon decayed plants, one based upon algae. Hence, ponds have a large number of different animal species using the wide array of food sources.
They, provide an important source of biological diversity in landscapes. Vernal ponds are ponds. Occurring vernal ponds do not have fish, they are called vernal ponds because they are at their peak depth in the spring. The absence of fish is a important characteristic since it provides amphibians with breeding locations free from predation by fish. Hence, introducing fish to a pond can have detrimental consequences.
In some parts of the world, such as California , the vernal ponds have rare and endangered plant species. On the coastal plain, they provide habitat for endangered frogs such as the Mississippi Gopher Frog. Ponds, being small, are disrupted by human activity, such as hikers.
Drainage of ponds is a fr.
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From Wikipedia, the free encyclopedia. For the glowing pet fish, see GloFish. For the salmon fish variety grown for food, see AquAdvantage salmon. For the invasive fish species in North America, see Northern snakehead. Simon Barrett Scott Clevenger. Tory Kittles K. Syfy Columbia-TriStar.
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Related Images. YouTube Videos. Initially inspired by literature from authors like Edgar Allan Poe, Bram Stoker, and Mary Shelley, horror has existed as a film genre for more than a century. The macabre and the supernatural are frequent themes. A famous scene from the German horror film Nosferatu. It may arise naturally in floodplains as part of a river system, or be a somewhat isolated depression. A pond in Swarzynice , Poland. During the last thirty years of his life, the main focus of Claude Monet's artistic production was a series of about oil paintings depicting the lily pond in his flower garden.
A biologist is a scientist who has specialized knowledge in the field of biology, the scientific study of life. Francesco Redi , the founder of biology, is recognized to be one of the greatest biologists of all time. Martinus Willem Beijerinck , a botanist and microbiologist.
VHS is a standard for consumer-level analog video recording on tape cassettes. It is virtually identical to the Japan version. Top view of VHS with front casing removed. Vincent Price headlines a cast of veteran character actor s along with a young Jack Nicholson. Republic Pictures ' Pals of the Saddle lasts just 55 minutes, average for a Three Mesquiteers adventure. Often marketed as pure sensationalism, many films noir also possessed great visual beauty.
Raw Deal , writes scholar Robert Smith, is "resplendent with velvety blacks, mists, netting, and other expressive accessories of poetic noir decor and lighting". Rocketship X-M , produced and released by small Lippert Pictures, is cited as possibly "the first postnuclear holocaust film".
It was at the leading edge of a large cycle of movies, mostly low-budget and many long forgotten, classifiable as "atomic bomb cinema". The snakeheads are members of the freshwater perciform fish family Channidae, native to parts of Africa and Asia. These elongated, predatory fish are distinguished by their long dorsal fins, large mouths, and shiny teeth.
Northern snakehead , Channa argus. A bowfin , a living fossil , often confused with the snakehead. DVD is a digital optical disc storage format invented and developed in The medium can store any kind of digital data and is widely used for software and other computer files as well as video programs watched using DVD players.
See text for details. The noodler places their hand inside a discovered catfish hole. Many other names are used in different regions for the same activity.
Lee McFarlin with a fish caught by noodling. Full Cast and Crew.
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For him the outside world was Most Memorable Emmys Moments. Share this Rating Title: The Promotion 5. Use the HTML below. Take a look back at the most memorable moments ever to grace the Emmys, including the shortest acceptance speech in Emmys history! Zigra ; goblin shark -like kaiju Ghost Shark ; undead great white shark Ghost Shark 2: Killer Fish ; piranhas Mega Piranha ; overgrown mutant piranhas Piranha ; genetically enhanced piranhas   Piranha II: Examples of use in the German literature, quotes and news about Amok.