According to current theories of evolution of organic world Essays

According to current theories of evolution of organic world Essays According to current theories of evolution of organic world Paper According to current theories of evolution of organic world Paper Essay Topic: Current According to current theories of evolution of organic world, total diversity of biological species evolved from universal single-celled progenitor organism of extremely primitive constitution. These progenitors were heterotrophic and received nutrients from the primal ocean, enriched by simple organic compounds. Subsequent differentiation of these first organisms resulted in formation of eucariotic cells, autotrophic cells capable of photosynthesis and first multicellular colonies. As a result of intensive photosynthesis large amounts of free oxygen appeared in the atmosphere. Thus more effective aerobic ways of metabolism became possible. Having mastered photosynthesis and breathing, living organisms started to acclimate to the different zones and locations. These organisms were subjected to different sets of environmental factors. While adapting to these different conditions, organisms obtained different sets of adaptive features that were secured by the natural selection. The deeper was specialization of the group of organisms, the more unique set of features it developed. Thus the biological diversity had formed. 2. I am agree with the theory of evolution, because it explains in a logical and consistent way how the life had emerged and developed to its current diversity of species. Also theory of evolution explains the processes that are implemented widely by the human race since stone age to cultivate species of plants and animals in a fashion most fit to satisfy the needs and requirements of certain climatic zone. Application of principles of natural and artificial selection allows to predict approximately what effects will have influence of certain factors during production of new breed or species and how should directional selection be performed to cultivate breeds or sorts with desired qualities. Theory of evolution also makes sense of paleontologic discoveries and allows to analyze and predict relation between more or less distant groups of organisms based upon constitution of their predicted common progenitors. 3. Artificial selection and genetic engineering are widely applied in contemporary scientific research works, industrial processes and in production of agricultural goods. Logically arises question if these artificial, human-governed factors could influence natural processes of evolution. Artificial selection is, in fact, natural selection that is directed and controlled to obtain certain desired features in a breed of an existent species. Artificial selection can result in formation of new species only if applied continuously over very extended periods of time. Such activity may contribute certain scientific interest but hardly could be economically profitable and, hence, hardly can be expected to happen. Genetic engineering, though, is a tool that is potentially capable of much more swift and radical changes than natural or artificial selection could ever provide. So in theory it is possible to expect certain impact of products of genetic engineering upon natural evolution. That is why experiments based on genetic engineering should be designed carefully and well-thought before application. : 1.  Ã‚   BCB705 Biodiversity: Chapter2 Evolution of Biodiversity. 3 Jun. 2008. The Department of Biodiversity Conservation Biology and The University of the Western Cape. 3 January 2009 http://planet.uwc.ac.za/nisl/biodiversity/Chapter2/index.html

How Blue Lava Works

How Blue Lava Works Indonesias Kawah Ijen volcano has gained internet fame for Paris-based photographer  Olivier Grunewalds photographs of its stunning electric blue lava. However, the blue glow doesnt actually come from lava and the phenomenon isnt restricted to that volcano. Heres a look at the chemical composition of the blue stuff and where you can go to see it. What Is Blue Lava? The lava that flows from the Kawah Ijen volcano on the island of Java is the usual glowing red color of molten rock flowing from any volcano. The flowing electric blue color arises from the combustion of sulfur-rich gases. Hot, pressurized gases push through cracks in the volcano wall, burning as they come into contact with air. As they burn, sulfur condenses into a liquid, which flows downward. Its still burning, so it looks like blue lava. Because the gases are pressurized, the blue flames shoot up to 5 meters in the air. Because sulfur has a relatively low melting point of  Ã‚  239 °F (115 °C), it can flow for some distance before solidifying into the familiar yellow form of the element. Although the phenomenon occurs all the time, the blue flames are most visible at night. If you view the volcano during the day, it wouldnt appear unusual. Unusual Colors of Sulfur Sulfur is an interesting non-metal that displays different colors, depending on its state of matter. Sulfur burns with a blue flame. The solid is yellow. Liquid sulfur is blood red (resembling lava). Because of its low melting point and availability, you can burn sulfur in a flame and see this for yourself. When it cools, elemental sulfur forms a polymer or plastic or monoclinic crystals (depending on conditions), that spontaneously change into rhombic crystals. Make Plastic SulfurMake Sulfur Crystals Where To View Blue Lava The Kawah Ijen volcano releases unusually high levels of sulfuric gases, so its probably the best place to view the phenomenon. It is a 2-hour hike to the rim of the volcano, followed by a 45-minute hike down to the caldera. If you travel to Indonesia to see it, you should bring a gas mask to protect yourself from the fumes, which may be harmful to your health. Workers who collect and sell the sulfur typically do not wear protection, so you can leave your mask for them when you leave. Although the Kawah volcano is most readily accessible, other volcanoes in the Ijen may also produce the effect. Although it is less spectacular at other volcanoes in the world, if you view the base of any eruption at night, you may see the blue fire. Another volcanic location known for the blue fire is Yellowstone National Park. Forest fires have been known to melt and burn sulfur, causing it to flow as burning blue rivers in the park. Traces of these flows appear as black lines. Molten sulfur may be found around many volcanic fumaroles. If the temperature is high enough, the sulfur will burn. Although most fumaroles arent open to the public during the night (for fairly obvious safety reasons), if you live in a volcanic region, it might be worth watching and waiting for sunset to see if there is blue fire or blue lava. Fun Project To Try If you dont have sulfur but want to make a glowing blue eruption, grab some tonic water, Mentos candies, and a black light and make a glowing Mentos volcano.