|
Enter your query below to search our database containing over 50,000+ essays and term papers
Search results 20531 - 20540 of 30573 matching essays
- 20531: Thoeries of Evolution
- ... that environmental changes evoked in individual animals direct adaptive responses that could be passed on to their offspring as inheritable traits. This generalized hypothesis of evolution by acquired characteristics was not tested scientifically during Lamarck's lifetime. A successful explanation of evolutionary processes was proposed by Charles Darwin. His most famous book, On the Origin of Species by Means of Natural Selection (1859), is a landmark in human understanding of nature ... leads to an eventual adaptation of the population as a whole, or the population becomes extinct. Evolution proceeds by the natural selection of well-adapted individuals over a span of many generations, according to Darwin's theory(Microsoft 96). The parts of Darwin's theory that were the hardest to test scientifically were the interferences about the heritability of traits because heredity was not understood at that time. The basic rules of inheritance became known to science during ...
- 20532: Nuclear Waste Disposal At Yucca Mountain: Right or Wrong?
- ... babies and phosphorescent people come to mind. This is an unfounded worry, as many reasons prove. In fact, the Yucca Mountains provide an ideal site for a permanent underground nuclear waste facility in the U.S. While the Yucca Mountains are the best site we have found as of yet, this procedure will cost a huge amount of taxpayer dollars. The Department of Energy (DOE) estimates the total cost of its ... bomb. That is why the Yucca Mountains are being speculatively chosen for this purpose. Throughout the United States, no better area has been found. Safety of this hazardous material is not only crucial in it's final resting place. Security en route to the site is also of utmost importance. If this site is chosen, a safe transportation method will be needed to move the radioactive materials to the Yucca mountains ... obviously. And as the nation waits, the costs multiply. But expenses are second only to safety of the facility and speed in which it is constructed. At the present moment, all of the United State's nuclear waste is held in above-ground pools and airtight casks, inside the country's many commercial power plants. This is all right for now, but how much longer will there be enough space ...
- 20533: Nuclear Energy: Uranium Fission
- ... is our oceans. Sea water contains 3.3x10^(-9) (3.3 parts per billion) of uranium, so the 1.4x10^18 tons of sea water contains 4.6x10^9 tons of uranium. All the world's electricity usage, 650GWe could therefore be supplied by the uranium in sea water for 7 million years(Energy 25). This is a only a theoretical number because it is not possible to get all of ... no danger of exhausting these sources of energy. We need to exploit these resources an d use them to our advantage. God has given us the knowledge to use uranium for power, so why shouldn't use it? There are many benefits to using nuclear generated power over our other common sources. A big advantage of nuclear power plants is that they do not burn anything, they are non-polluting, and ... By mid 1996, there were 32 countries of varying size, political persuasion, and degree of industrial development, which included nuclear power in their energy mix and were operating nuclear reactors. About 17% of the world's electricity is being produced by some 440 reactors, with 30 more under construction. Belgium, China, France, Hungary, India, Japan, Switzerland, UK, USA, and Russia are just some of the countries with major nuclear energy ...
- 20534: The Space Shuttle
- ... and passengers. The upper part of the spacecraft, the orbiter stage, had a theoretical lifetime of perhaps 100 missions, and the winged orbiter could make unpowered landings on returning to earth. Because of the shuttle's designed flexibility and its planned use for satellite deployment and the rescue and repair of previously orbited satellites, its proponents saw it as a major advance in the practical exploitation of space. Others, however, worried ... missions. The first space shuttle mission, piloted by John W. Young and Robert Crippen aboard the orbiter Columbia, was launched on April 12, 1981. It was a test flight flown without payload in the orbiter's cargo bay. The fifth space shuttle flight was the first operational mission; the astronauts in the Columbia deployed two commercial communications satellites from November 11 to 16, 1982. Later memorable flights included the seventh, whose crew included the first U.S. woman astronaut, Sally K. Ride; the ninth mission, November 28-December 8, 1983, which carried the first of the European Space Agency's Spacelabs; the 11th mission, April 7-13, 1984, during which a ...
- 20535: Genetically Altered Foods
- ... the money that has been involved, as well as the concern for ones health. To the knowledge of most, the United States can be very manipulative or should I say persuading, so therefore it doesn't take much on their part to convince the regulators that the crops are safe. Those who protest have debated on a list of concerns dealing with this issue. For example, one of which brings a ... that there would need to be a great amount of events that would have to take place. The transferring of DNA to the bacteria is just one of which was addressed. Therefore, the issue isn't settled. One then can only assume that until a hault is put on altering, the industry will keep producing. My opinion is that as long as there has been no proof of illnesses with the ... because if you can cut cost and increase in yields, well then more power to you. Another positive aspect is, as of right now not a single soul has ended up being harmed. The opposing's opinion is valid also, though I think they are trying to look to much into the issue by critiquing it, instead of backing the agri-business by creating a line of trust. I think ...
- 20536: Water Pollution
- ... maintain motor vehicles, electroplate, operate printing and coping equipment, perform dry cleaning and laundry services, process photographs, operate labs, involve building and construct roads, provide pest control, preserve wood, and make Furniture. Water pollution doesnΉt just effect humans, it affects are whole ecosystem. Birds and marine life are affected by it. More than fifty species of birds are known to ingest plastic. When they eat plastic, they feel full, so ... and are common in August through December. Water is our main source of our life. We need it to live, drink, bathe, recreation, manufacturing, and power. We need water for almost everything; if we don't start cleaning up we will be in big trouble. Bunches of families dispose of chemicals everyday. It affects us drastically and we depend on it to be clean. Right now the government is fining people ... public. In some places water pollution is a main concern. The last defense of water pollution is water treatment. Their are two main reasons for water treatment. The first one is to protect the public's health. The second one is to protect the water quality. Most of the waste water comes from industries, homes, businesses, storm runoff, ground water, and schools. Also sludge is being treated to remove some ...
- 20537: Cathedrals
- ... to the style by Renaissance scholar, Giorgi Vasari, who incorrectly attributed the form to the Goths, Germanic invaders who helped lead to the downfall of the Holy Roman Empire and its classic ideals. In it's own time; Gothic architecture was referred to as "modern" or "French" architecture. The basic concepts and standards of Gothic form are colored, darkened and diffused light. A vertical rush to the sky, a synthesis of ... edge with neighboring cathedrals and towns. Gothic Cathedrals were built primarily to contain holy relics and serve as pilgrimage destinations for the faithful, which would help lead into increased traffic and feed into the community's economy and culture. Early Gothic was the first, primary core of what was to later evolve and develop into a more sophisticated idealized Gothic structure, and was a stage of much experimentation of what did and didn't work. (However, Gothic builders continued to experiment throughout later styles and as a result, numerous cathedrals collapsed and had to be rebuilt). Another aspect of Early Gothic architecture was the development of barrel vaulting ...
- 20538: Ozone
- ... ultimately reduction in crop yields, forest annual increments and a general decline in forest ecosystem health. The UV-B radiation also causes the potential for the decrease in the populations of phytoplankton in the world's oceans, causing yet more problems when one analyzes phytoplankton in the oceans food chain (Clair, 1996). Humans are responsible for almost all activities and pollutants that deplete the ozone layer. Humanity has damaged the ozone ... implemented a UV index to provide information to the general public on specific UV hazards daily. Constant monitoring, global awareness and the eventual phase-out of all ozone depleting substances are all part of Canada's measures for the protection of the ozone layer. Environment Canada highlights five measures being taken to control Canada's ozone depleting substances: ¨Canada's ozone depleting substance phase-out plan, developed as a result of the Montreal Protocol, has accomplished many of its goals already. ¨Most new cars with air conditioning manufactured in ...
- 20539: Malibu Fires
- ... unfortunately sometimes we take advantage of our natural surroundings. We find ourselves amidst a struggle between our lifestyles and nature. Although we affect nature profoundly with our activities, we in turn are shaped by nature's potent forces. Nature can be brutal to humans, but we must remember that it merely is following its course. As a result, we must learn to coexist with it. Fire is a naturally occurring phenomenon ... 74 homes were destroyed (Wildfire sec. 3 p.1). Another painful memory for Topanga Canyon occurred between 1938 and 1943, during which time three fires destroyed more than 600 structures. 1993 featured one of Malibu's most devastating firestorms. When traveling through Malibu's scenic landscape, it is almost impossible to imagine that this beautiful environment could foster such a deadly fire. Lovely ocean- view homes are nestled within the lush vegetation of the mountainous landscape. In fact, ...
- 20540: Chimpanzee
- ... that chimpanzees near the Ugalla River of western Tanzania also consume mammals.(Riss, 1990:167) Cannibalism has also been recorded both in the Budongo Forest, Mahale Mountains and the Gombe National Park. In Jane Goodall's, May 1979 article in the National Geographic called "Life and Death at Gombe" it reveals the first time that chimpanzees who were always perceived to be playful, gentle monkeys, could suddenly become dangerous killers. "I ... infants that not only belong to the same community but are likely to be their own offspring."(Turner 1992:151) On October 3, 1989, a case of within-group infanticide among Mahale chimpanzees was observed. T. Asou, M. Nakamura and two cameramen of a video team of ANC Productions Inc. from Tokyo, and R. Nyundo of the Mahale Mountains Wildlife Research Centre succeeded in shooting most of the important scenes of ... again on "July 24, 1990, M.B. Kasagula, a research assistant, observed five adult males including Ntologi excitedly displaying."(Nishida, 1992:153) Ntologi had his hand on a 5-month-old male infant of Betty's. The infant was still alive. Ntologi began to bite on the infants' fingers and then struck the infant against a tree trunk, and also dragged it on the ground as he displayed. As a ...
Search results 20531 - 20540 of 30573 matching essays
|
