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Pesticides

... very often used in lumber. Rodenticides are used to kill rodents such as rats and mice. These rodents can carry bacteria that cause diseases like rabies and typhus, and can also contaminate food supplies. Insecticides are used by farmers who want to exterminate some of the many harmful insects that can carry disease. Insecticides are very widely used, not only on farms, but in residential areas in the form of products like Raid, and ant traps. are dangerous to our environment, but in most cases they help more than they hurt. For example ...

Number of words: 554 | Number of pages: 3

Deforestation Of The Pacific Northwest

... could no longer be hunted, collected, injured or killed. The northern spotted owl falls under the more serious condition of being endangered. Also, the bill forbids federal agencies to fund or carry out any activity that would threaten the species or its' habitat. It is the latter part of the bill that causes the controversy. Under the ESA, loggers should not be allowed to cut down the old- growth of the forest. The old growth of a forest includes the largest and oldest trees, living or dead. In the case of the North Coast forests, this in ...

Number of words: 1195 | Number of pages: 5

Keeping The Snake River Dams

... Snake River are under proposal to be removed. Today I’m going to let you know why there is debate and why we should fight to keep the dam. By the end of my speech you will be aware of how this argument came about, and the economic impact of what will happen. I will end my speech by reinforcing one of the purposed solutions. As I have stated before in 1992 there was a changing event when four species of salmon were placed on the Endangered Species List. According to a Protecting the Environment ’99 article “A look at the impacts of remo ...

Number of words: 413 | Number of pages: 2

Causes Of Schizophrenia

... few clues available about the causes. This is not for lack of effort. Literally hundreds of causes have been proposed. They include viruses, accidental injury before and after birth, as well as illicit substances. However, only inherited factors are generally accepted as significant causes. Evidence for such factors comes from every day experience: it is common to find families with several affected members. While such clustering'could also be due to shared non-inherited (environmental') factors,more convincing evidence has come from twin ...

Number of words: 959 | Number of pages: 4

Air Pollution

... pollution is caused by many things such as car fumes, burning of fossil fuels, furnaces. By letting all these gases release into the air, it makes it harder to breathe. Ozone can cause part of your lungs to close off and make it harder to breathe. The tall smokestacks used by industries and utilities do not remove pollutants but simply boost them higher into the atmosphere. These pollutants may then be transported over great distances, causing adverse effects such as acid rain in areas far from the emission site. The worldwide incre ...

Number of words: 320 | Number of pages: 2

Development Of Charles Darwin

... out of a failure at schooling and a timid bearer of the theory that toppled Biblical science forever. Where did it all begin? What was the factor that started the ball rolling, and gave it the momentum to keep lurching ahead? "As a distraction from his sister's regime, Charles played solitary games in the vast family home. His father had become interested in the fashionable study of natural history and there were rooms full of exotic collections, stuffed animals and old bones. A massive greenhouse attached to the side of the house was a v ...

Number of words: 2239 | Number of pages: 9

Mitochondrial Dna

... starts the reactions by stimulating effectors, called adenlyl cyclase, which in turn produces a second messanger, cyclic AMP. The cyclic AMP triggers the activation of adrenylyl cyclase. This communication would not be possible if not for the guanine nucleatides that allow the binding of the enzymes to occur. Not only does epinephrine trigger the chemical reactions by bonding to the guanine nucleotides, but they also trigger the production GDP by reducing GTP to its subserviant level. Not all effectors are triggered by simply hor ...

Number of words: 349 | Number of pages: 2

Nuclear Power

... Fossil fuels are developed from the remains of plants and animals that died millions of years ago. Burning fossil fuels has other downfalls, too. All the burning that is required to turn the turbines releases much sulfur, nitrogen gases, and other pollutants into the atmosphere. The cleanest, cheapest, and least polluting power plant of the two types is the hydroelectric power plant. The main reason most countries use thermal versus the hydroelectric is because their countries don’t have enough concentrated water to c ...

Number of words: 356 | Number of pages: 2

Alternative Fuels (fuel Cells)

... electric power plants, and zero-emission vehicles. The fuel cell was first developed in the 1960's by General Electric for NASA. It was considered as a definite possibility for an alternative power source for space program, but the cost and size of the fuel cell stacks were tremendous. By 1983, Geoff Ballard and a small team of physicists were able to develop the Proton Exchange Membrane (PEM) to produce nearly ten times as much energy, while being only a fraction of the size. How the PEM Fuel Cell Works: A fuel cell is an electrochemical d ...

Number of words: 1185 | Number of pages: 5

Cardiac Pacemakers

... the heart rhythm, called arrhythmias, can disrupt this normal cardiac control making it necessary to use some artificial means to regulate the rhythm of the heart. Today, some half a million men and women, most of them over the age of sixty, carry implanted that take over the duties of the natural conduction system. Tens of thousands of these devices are implanted each year in this country alone. Over the past thirty years have evolved from simple devices only capable of fixed-rate stimulation of a single chamber of the heart to more sop ...

Number of words: 2766 | Number of pages: 11

Our Solar System At A Glance

... the European Renaissance. Fundamental physical laws governing planetary motion were discovered, and the orbits of the planets around the Sun were calculated. In the 17th century, astronomers pointed a new device called the telescope at the heavens and made startling discoveries. But the years since 1959 have amounted to a golden age of solar system exploration. Advancements in rocketry after World War II enabled our machines to break the grip of Earth's gravity and travel to the Moon and to other planets. The United States has sent ...

Number of words: 4469 | Number of pages: 17

Evolution

... THEORY ................................. 25 MORPHOLOGICAL & BIOLOGICAL CONCEPTS ....................... 27 BIO-EVOLUTION: POPULATION vs. INDIVIDUALS ................ 29 MECHANISMS FOR GENETIC VARIATION .......................... 31 GENETIC VARIATION AND SPECIATION .......................... 35 DARWIN'S FINCHES .......................................... 37 SPECIATION vs. CONVERGENT EVOLUTION ....................... 39 CONCEPT OF ADAPTATION ..................................... 41 PUNCTUATED EQUILIBRIUM ......................... ...

Number of words: 9024 | Number of pages: 33

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