.... are vestigial in females and not much larger in males. are parthenogenic and for most of the year populations consist entirely of females which reproduce asexually. As winter (or sometimes spring) approaches males appear and sexual reproduction occurs typically involving the production of resistant, over-wintering eggs. Such eggs are usually enclosed in a purselike ephippium that rests in the sediment at the bottom of the lake or pond until spring at which time the eggs hatch. 1. Daphnia magna. Take a small culture dish to the instructor to receive a few living D. magna. This is a very large species, as go, and one that is easily cultured in the laboratory. .....

.... what a germ even was. Louis Pasteur (1822-1895) was the famous French scientest who first discovered germs, and that they were the main cause of most diseases. After Pasteur's significant discovery people began to be much more conscious of their personal hygiene. Such as, brushing their teeht and bathing more persistently. Pastuer opened the doors to a series of new remedies and discoveries. Some of these would include pasteurized milk(you can see where it received it's name), bacteria, fermentation, yeast, and rabies:to name a few. Within a year of Pasteur's remedy for rabies, he treated and cured maore than 2,000 patients. A German pathologist named Rober .....

.... addict as someone hooked on crack, cocaine, morphine or heroin. The folks that say they don't want to quit, because of the pleasure they derive from smoking, are not really speaking for themselves. It is their addiction speaking for them. It is that little addicted voice inside their minds rationalizing the addiction, because they know, it might hurt to quit. They know that there will be a sense of loss. They know that smoking is as much a part of their personality as being a happy person, or being a morning person, or liking to go to the movies. Smoking becomes a part of who and what you are, An addict. It amazes me the number of people who smoke cigarettes .....

.... in England. He isolated it. In 1862, the French chemist Claude August again isolated it. Thallium comes form the Greek word "thallos". "Thallos" meant "green twig" or "green shoot". Thallium does not have many uses. It is used in photocells because of the electrical conductivity of thallium sulphide. Thallium was originally used to help treat ringworm and many other skin infections. It was then limited because of the narrow margin between the benefits and its health risks. Thallium bromide-iodide crystals are still used as infrared detectors. Thallium sulphate used to be widely used as a pesticide and an ant killer. It was odorless and tasteles .....

.... of the neck, or, less commonly, diarrhea and pain in the extremities. Because nerve cells that control muscular movement are not replaced once they are destroyed, virus infection can cause permanent paralysis. When nerve cells in respiratory centers, which control breathing, are destroyed, the victim must be kept alive by an iron lung (see Artificial Respiration). For every paralytic case of myelitis, however, there may be 100 nonparalytic cases. Treatment Because no drug developed so far has proved effective, treatment is entirely symptomatic. Use of moist heat coupled with physical therapy to stimulate the muscles was first initiated by the Australian nur .....

.... energy resources, and at present about 80 per cent (Myers, 1994) of the world's commercial energy is derived from oil, coal and gas. Although it has been observed that the growth of energy consumption is closely correlated with the increases in gross national product thus our economic development, the major sources of energy (that is fossil fuels) are 'stock resources'. Fossil fuels are consumed by use and the current consumption patterns are non-sustainable. It is recognised that energy conservation and the development of renewable energy sources will be needed to sustain economic growth. The quantity of ultimately recoverable fossil fuels is limited by g .....

.... single part of the world except Antarctica. They were once trained by kings to hunt and bring back kills. This sport, called Falconry, is still popular. However, in the 1960s the American falcon came close to extinction. Most of the damage was done by poisons that farmers used to kill insects. The worst poison was DDT. By the time naturalists learned of DDT's effect on wildlife, it was almost too late. The American peregrine's scientific name is Falco peregrinus anatum. At one time, people called this falcon a duck hawk. That was a poor name, since falcons aren't hawks and they rarely kill ducks. The American peregrine was once found all across the .....

.... rear their children. Businessmen use in preparing advertisements and designing products that appeal to customers. Psychological tests help people choose careers. Employers use tests as tools to help decide whether or not a person is fitted for a certain job. Psychologists help people with emotional problems to understand the basis of their difficulties. This understanding often brings a solution to the problems. A psychologist's specialty and place of employment determines their working conditions. Clinical, school, and counseling psychologists in private practice have pleasant, comfortable offices and set their own hours. However, they often must offe .....