.... of the sea otters coastal system it was possible to gain much insight into the sea otter ecological role in kelp-forest ecosystem. Over the years it's been possible for us to observe the kelp-forest ecosystem over-time, thanks to the massive growth of the sea otters population we observed the change from otter- free to otter-dominated. This article relates to many aspects of our textbook. On page 89 in chapter 5 the text explains what an ecosystem is, defined by the book, it's a community of species interacting with one another where there is a non-living .....

.... of an aquatic medium, a terrestrial plateau and celestial ether that is conducive to human respiration. There are two planets from which to choose: Mars and Venus. Martyn J. Fogg authored what is regarded as a textbook of the future called Terraforming: Engineering Planetary Environments. I have chosen Fogg's book as my second primary source because it is the only book of its kind that addresses the question of terraforming in a non- science fiction context. The successful terraformation of a planet requires the synthetic development of a biosphere. The pro .....

.... with the firs t appearance of abundant fossils especially Trilobites, which characterizes a succeeding point in time. During the Cambrian Period the lapetus Ocean appeared, the predecessor of the Atlantic Ocean, which separated the young North American and Eurasian continents. Also Gondwanaland was in the final stages of development. Gondwanaland was a very large continent made up of what is now South America, Africa, Arabia, Madagascar, India, Australia, and Antarctica. Large shelled organisms first emerged during the Cambrian. Also Earth¹s atmosphere contained the same amount of oxygen as i .....

.... became widely available in the 1940s, they have been hailed as miracle drugs -- magic bullets able to eliminate bacteria without doing much harm to the cells of treated individuals. Yet with each passing decade, bacteria that defy not only single but multiple antibiotics -- and therefore are extremely difficult to control -- have become increasingly common. What is more, strains of at least three bacterial species capable of causing life-threatening illnesses (Enterococcus faecalis, Mycobacterium tuberculosis and Pseudomonas aeruginosa) already evade every .....

.... absorbed into the gastrointestinal tract. It works in about one hour. The liver detoxifies 90% of it by mixing it with sulfuric acid, and another 3-5% is catabolized by enzyme reactions to the acid. The metabolites are excreted in the urine. The dosage of the drug should be used according to the carton instructions. A 10 gram over dose in adults, 140 mg for kids, can cause permanent liver damage. Also if you had just taken some other drugs , The may become more toxic since the drugs are catabolized in the liver. To protect yourself from injury, you sho .....

.... now a real idea. The climate of Mars about 3.8 billion years ago was much similar to the young Earth. Microbes and bacteria probably sprouted everywhere in the warm and wet climate. Although now we only see a cold red planet, which was probably due to a collision of an astroid that would have set back the evolution process of Mars, causing it to be a harsh planet. A Viking spacecraft which landed on Mars in 1976 found that the planet was bathed in ultraviolet radiation, "intense enough so it would probably fry any microbe we know on this planet,"says Jack Fa .....

.... information sources. The same advanced techniques also make possible invasions of privacy and of restricted information sources, but computer crime has become one of the many risks that society must face if it would enjoy the benefits of modern technology. Imagine a world without . That would mean no proper means of communicating, no Internet, no video games. Life would be extremely difficult. Adults would have to store all their office work paper and therefore take up an entire room. Teenagers would have to submit course-works and projects hand-written. All grap .....

.... in a reaction that liberates an atom of chlorine, which destroys ozone by oxidising with the Ozone molecules, forming Cl-O and Oxygen. One atom of chlorine can destroy 10,000 ozone molecules! Atoms containing bromine, nitrous oxide, and hydrogen oxide radicals are also primarily dangerous. As a result, the Ozone in the stratosphere has been reduced to such an extent that ozone holes are appearing around the globe, in particular one over Antarctica that in 1995 measured 8.2 million square miles. This depletion has allowed more dangerous UV-B radiation to reach th .....