.... definition to include an ecological component; “..a reproductive community of populations (reproductively isolated from others) that occupies a specific niche in nature The BSC is greatly accepted amongst vertebrate zoologists & entomologists. Two reasons account for this .Firstly these are the groups that the authors of the BSC worked with. (Mayr is an ornithologist & Dobzhansky has worked mainly with Drosophila). More importantly Sexual reproduction is the predominate form of reproduction in these groups. It is not coincidental that the BSC is less widely used amongst botanists. Terrestrial plants exhibit much more greater diversity in their mode of reproduction than ....

.... 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 increase in the burning of coal and oil since the late 1940s has led to increasing concentrations of carbon dioxide. The resulting greenhouse effect has reduced the escape of infrared radiation from the earth, causing a possible global warming trend. The Prevention of Air Pollution To c ....

.... in it's purist form that gold bars can be indented by your hands if pressed on. Jewelers often use 18-karat gold, which is three fourths gold. The lower the karat of the gold, the more alloy is in it. An alloy is a metal mixed with another metal to make that metal stronger. This metal is used in many ways including, tooth filling because it doesn't rust away or crack, also it is used for the covering or sealing of an astronaut's helmet. Gold is also a very good conductor of electricity. As you can see, gold is an element that is not only a great gift for someone, but is very usefull if actually put to use. The main drawback to gold is that it is a very precious metal. W ....

.... in France and the United States. The project started in 1990 and was slated to take 15 years and cost $3 billion in U.S. money for the entire project coming to roughly $200 million per year. Federal funding for the project is nearly 60% of the annual need. This has created some funding problems for the project. There also have been technological advances and discoveries that have helped to speed up the project. This automation may help to reduce the cost and help the project to meet its objectives ahead of schedule. The project was estimated to have detailed maps of all of the chromosomes and know the location of most of the human Genes by 1996. Researchers have succe ....

.... sulfuric, nitric and carbonic acid. This acidic solution eventually condenses in the air and comes back down to the earth in any from of precipitation (snow, rain, hail). Upon returning to the earth, the acidic precipitation can have serious repercussions on both the environment and as well as human structures. On average, acid rain is about nine times more acidic than rain water, and has been recorded as low as 2.5 on the pH scale (forty times more acidic than water.) Acid deposition kill fish, soil bacteria, and as well as aquatic and terrestrial plants. the acid also drain the soil of essential nutrients such as aluminum and releases them into bodies of water such as str ....

.... -at the staggering rate of 100,000 per year, a figure that works out to almost 2000 species per weak, 300 per day, 10 per hour, another dead species every 6 minutes. We're trashing the planet, washing away the topsoil, paving over our farmlands, systematically deforesting our wildernesses, decimating the biota, and ultimately killing ourselves. The world is getting progressively poorer, and it's all because of populating, or more precisely, over-population. There's a finite store of resources on our pale blue dot, spaceship Earth, our small and fragile tiny planet, and we're fast apporaching it's ultimate carrying capacity. The limits to growth are finally upon us, and we' ....

.... said that most of the now being used commercially is in the agricultural sector. Plants are genetically engineered to be resistant to herbicides. Insects are being genetically engineered to attack crop predators. Wald noted that research is ongoing in growing agricultural products directly in the laboratory using genetically engineered bacteria. Genetically engineered animals are being developed as living factories for the production of pharmaceuticals and as sources of organs for transplantation into humans in the United States and abroad. Fish are being genetically engineered to grow larger and at a faster rate. According to U.S. News and World Report, many pharmaceuti ....

.... it is equal to 16,000 baseball diamonds [Miller 526]. By the year 2005, when the landfill is projected to close, its elevation will reach 505 feet above sea level, making it the highest point along the Eastern Seaboard, from Florida to Maine. At that height, the mound will constitute a hazard to air traffic at Newark airport [Rathje 3-4]. The area now encompassed by the Fresh Kills (Kills is from the Dutch word for creek) Landfill was originally a tidal marsh. In 1948, New York City planner Robert Moses developed a highly praised project to deposit municipal garbage in the swamp until the level of the land was above sea level. A study of the area predicted the marsh would ....