... steam ships (B.Nebel and R.Wright 1995). Stationary steam engines were rapidly established in all the major industries. The major fuel for steam engines was firewood. By the end of the 1800’s, the demand for energy was ever increasing and firewood around industrial centres was becoming scarce. This led to a switch to coal as the major source for fuel and energy. As well as powering steam engines coal became widely used for heating, cooking and industrial processes. Air pollution during the Industrial revolution was far worse than anything seen today. Apart from the smoke and fumes obscuring visibility, they also caused major health problems to the inhabitant ...

... (evolutionary) factors is examined. Lenski and May (1994) and Antia et al. (1993) predict the modulation of virulence in parasite-host systems by integrating evolutionary and transmissibility factors. INTRODUCTION Why do certain parasites exhibit high levels of virulence within their host populations while others exhibit low virulence? The two prime factors most frequently cited (Esch and Fernandez 1993, Toft et al. 1991) are evolutionary history and mode of transmission. Incongruently evolved parasite-host associations are characterized by high virulence, while congruent evolution may result in reduced virulence (Toft et al. 1991). ...

... and protozoa. They usually come from human sewage. As pathogen numbers increase, so does the risk of human health. Biochemical Oxygen Demand: Organic wastes that decay in a body of water. decrease the amount of oxygen found in it. The living things in the lake need oxygen to survive. If the oxygen level is depressed to zero, all fish in the lake die. Any decomposition that does not contain oxygen starts to generate noxious gases such as Hydrogen Sulfide. Pulp and paper mills, and municipal sewage causes BOD. Nutrients: Nutrients, particularly nitrogen and phosphorus, enrich waters and accelerate the aging of lakes and streams. Also, the result of this is rich ...

... The Greeks crowned newlyweds with oregano and planted it on graves as well as using the herb medically. Oregano’s German name, wurstkraut, reveals its use of seasoning sausages. The English used oregano for perfumes, washing waters, and used it for dyes to turn wool purple and linen reddish brown. In good health and quality, oregano should have good color, even sized leaf pieces and a fresh aromatic aroma. The leaves of oregano are very aromatic, slightly pointed and hairy. The flowers are white, and bloom from late July to September. Oregano grows to be 2 feet tall, and rich, moist soil makes the aroma and flavor of oregano weak. Oregano has been used for m ...

... acid rain. The main chemicals in air pollution that create acid rain are sulfur dioxide and nitrogen oxides. Acid rain usually forms high in the clouds where sulfur dioxide and nitrogen oxides react with water, oxygen, and oxidants. This forms a mild solution of sulfuric acid and nitric acid. These chemical reactions that change air pollution into acid rain can take from several hours to several days. Sunlight increases the rate of these reactions. Rainwater, snow, fog, and other forms of precipitation containing these mild solutions of sulfuric and nitric acids fall to the ground as acid rain. Years ago, when smokestacks were only a few stories tall, pol ...

... major architects. In effect, the corals build limestone, because their skeletons are made of Calcium Carbonate. The skeletons deposited by these corals and other organisms accumulate, along with sand and other debris, to form the backbone of the reef. Over tens of thousands of years, chemical and mechanical changes turn the reef into true rock. The body of a coral animal consists of a polyp, which is the living portion of the coral. A polyp is a hollow, cylindrical structure attached at one end to a surface, the other end is a mouth surrounded by tentacles which gather food and can sting prey to paralyse it. Polyps live in colonies, which grow from 1 to 7 inches ...

... of a failure that you have experienced. Being able to show a life lesson and reflect what you have learned from your failures prove that you are able to overcome obstacles and learn from your own mistakes. Lastly, he said to be able to describe a situation that you have resolved or fixed within a group. This illustrates your ability to be a team player, which is an important skill to possess in every job. All these three qualities can differentiate who you are, and that is the stepping stone of becoming a part of a company like Apple. Whipfler also gave reasons of why he chose to work for Apple. There are two main reasons why he was so attracted to Apple. ...

... what exactly a black hole is, we must first take a look at the basis for the cause of a black hole. All black holes are formed from the gravitational collapse of a star, usually having a great, massive, core. A star is created when huge, gigantic, gas clouds bind together due to attractive forces and form a hot core, combined from all the energy of the two gas clouds. This energy produced is so great when it first collides, that a nuclear reaction occurs and the gases within the star start to burn continuously. The Hydrogen gas is usually the first type of gas consumed in a star and then other gas elements such as Carbon, Oxygen, and Helium are consumed ...

... nobody wants to go out to shop and waste 4 to 5 hours rather every one of us would prefer to shop online at the same price and get delivered at our door step. The electronic retail marketplace demands the highest attention to visual graphic design quality, coupled with the ability to construct an electronic catalog. This catalog must support multiple layouts and instant credit card transaction processing. There are certain advantages and disadvantages of trading on the net. ? One can buy each and every product sitting at home. ? It saves lot of time. ? Sometimes it saves lots of money too. For example, “ when I registered for this fall term I visited the book ...

... days when I was young that I would just go for a walk in my grandfather's pasture. I would enjoy the quiet walks, and sometimes try to scare the cows, but more often than not, I would end up stopping to watch dung beetles frantically work on a big cow pat. I remember how disgusting it appeared, but I was just fascinated at the concept of cow poop being rolled into balls and taken away by bugs. To realize why dung beetles are so important, you must first know a few facts about them. Dung beetles are named after their delight in rolling up dung. Dung beetles utilize the dung of cows, horses, rabbits, deer, sheep, and many other animals. How many of you think ...