.... is a chemical agent that causes cancer. Sulphur dioxide is certainly one of the major atmospheric pollutants considered that it causes stinging eyes, lung damage, asthma, and acid rain. It is the result of coal-fired power stations. Nitrogen oxides that is produced by the exhaust of cars, causes pneumonia and asphyxia. The outcome of the well known dust particles is often underestimated. It is caused by industrial chimneys, car exhaust, and volcanic eruptions and it effects the environment by toxic effects and damage of the lungs. Radioactive isotopes which are caused by small quantiti .....

.... Australia and everyone innocent people died. A large-scale nuclear war would lessen food production over large expanses in the Northern Hemisphere, this could occur through acute climatic conditions which chilling or freezing temperatures occurring for brief periods during the growing season which could destroy crops or lower production. As result of the variety of potential physical and societal disruptions to agriculture from a large-scale nuclear war, agriculture in the Northern Hemisphere could be shut down or significantly reduced for the first growing season after war and ma .....

.... by an enzyme called "Luciferase". The light generated by this biochemical reaction has been utilized by scientists as a bioindicator for Tuberculosis as well as heavy metals. On going research involving bioluminescence is currently underway in the areas of evolution, ecology, histology, physiology, biochemistry, and biomedical applications. History of Bioluminescent Fungi The light of luminous wood was first noted in the early writings of Aristotle which occurred in 382 B.C.(Johnson and Yata 1966 and Newton 1952) The next mention of luminous wood in the literature occurred in 1667 by .....

.... to hit earth eventually. Asteroids ranging from fine dust, to house size rocks make up the belt around Saturn, and the belt on the outside of the orbit of Mars. These are pieces of larger rocks that were crashed into the remaining pieces after millions of years of crashes. Each ring system has distinctive features. Jupiter's rings are tenuous and made mainly of dark particles the size of those in cigarette smoke. The bright rings of Saturn are made of mainly frozen water in the form of snowballs and chunks of ice. Saturn has thousands of rings, some twisted, showing off dusty, spooky .....

.... cover from the earth's remaining grasslands. Each animal eats its way through 900 pounds of vegetation a month. Without plants to anchor the soil, absorb the water, and recycle the nutrients, the land has become increasingly vulnerable to wind and water erosion. More than 60 percent of the world's rangeland has been damaged by overgrazing during the past half century. Cattle ranching has also been linked to Global Warming. The grain-fed-cattle complex is now a significant factor in the emission of three of the gases that cause the greenhouse effect- methane, carbon dioxide, and nitro .....

.... it as a childhood disease although it can occur in adults who are not yet immune to it. This could lead to the belief of chickenpox being one of the oldest diseases. Since the chickenpox infection has two phases, one most common during childhood then a latent form that can become active again later in the persons life, doctors believe that this reactivation would start the cycle all over again. If everyone in the first cycle got the germ then became immune a whole new generation would be born by the time the virus “reawakened” to become infectious in the new generation. This causes .....

.... fundamental contributions to modern biology; Cellular biology, which is closely linked with molecular biology. Cellular biology deals with the functions of the cell and the basic strucural unit of living matter; Finally, population biology became firmly established as a major sub division of biological studies in the 1970’s. This field relates with the study of gene changes in populations, and ecology. Biology also includes the study of humans at the molecular, cellular, and organismal levels. If the focus of examination is the application of biological knowledge to human health, the .....

.... the smallest level, DNA is organized into a double helix. The DNA helix is then repeatedly coiled to allow more of it to fit into a compact space. This helix replicates and passes on its information to the body's cells. In humans, all the DNA is packaged into 46 separate molecules called "chromosomes." The chromosomes each contain thousands of genes, with each gene specifying how to make a particular protein necessary for cellular function. Scientists have long thought that the key to understanding human life lies in knowing the entire sequence of human DNA. Let's take a look at some of th .....

.... and harmful chemicals or other bad stuff. “In short, Impact = Population * Affluence * Technology.” (Ehrlich, 1990) The problem is that everyone cares too much about societies image of them that they don’t think about the results of their actions. We also have a problem with the consumption of our resources. Many of the resources that we rely like fossil fuels, forests, and water are non-renewable. We are rapidly depleting these and have nothing to use when they are gone. Our society will have a lot of trouble turning around their habits until we are desperately low o .....

.... may not always be sure that heat is given off. Our bodies do not burst into flames but the perspiration on our skin is a clue to what is happening. The movement of the windsurfer has a different explanation. The windsurfer is propelled along by a sail which collects mechanical energy from the winds that sweep along the water. This energy has been produced by the sun which warms the earth's surface and sets the air above in motion. The sun's heat comes to the earth as a form of radiant energy. When the heat reaches the surface of the earth, it causes the land or seas to rise in temperat .....