.... process, when an Austrian Monk named Gregor Mendel developed the basics of how genetics work. Using this, scientist studied the characteristics of organisms for the next one hundred years following Mendel's discoveries. These early studies concluded that each organism has two sets of character determinants, genes (Stableford 16). For instance, in regards to eye color, a child could receive one set of genes from his or her father that were encoded one blue, the other brown. The same child could also receive from its mother two brown genes. The conclusion is that the child would have a three out of four chance of having .....

.... it first collides, that a nuclear reaction occurs and the gases within the star start to burn continuously. The Hydrogen gas is usually the first type of gas consumed in a star and then other gas elements such as Carbon, Oxygen, and Helium are consumed. This chain reaction fuels the star for millions or billions of years depending upon the amount of gases there are. The star manages to avoid collapsing at this point because of the equilibrium achieved by itself. The gravitational pull from the core of the star is equal to the gravitational pull of the gases forming a type of orbit, however when this equality is broken the star c .....

.... the process of bioaccumulation can result in top-level predators such as humans to have contaminants at levels many million times greater than the environmental background levels (Guilette 1994). In field studies, toxicity caused by endocrine disruption has been associated with the presence of certain pollutants. Findings from such studies include: reproductive disruption in starfish due to PCBs, bird eggshell thinning due to DDT, reproductive failure in mink, small penises in alligators due to DDT and dicofol (Guillette 1994, Colburn et al 1996). In addition, a variety of reproductive problems in many other species are claim .....

.... arise from the burning of coal and from industrial processes. Atmospheric particles can scatter and absorb sunlight which reduces visibility. Particles also reduce visibility by attenuating the light from objects and illuminating the air causing the contrast between the objects and their backgrounds to reduce. Not only does it effect visibility, but it hastens the erosion of building materials and the corrosion of metals, interferes with the human respiratory system, and brings toxic materials into the body. The small particles cause chronic bronchitis, bronchial asthma, emphysema and lung cancer (Hodges 59). The second type i .....

.... social skills. He said that part of the problem with ADHD children was "deficient training in the home." In 1923, researcher, F. G. Ebaugh, was one of the first to publish a professional paper recognizing ADHD as a long-term problem requiring cooperation and intervention by several professional disciplines. Over the past four decades, dozens of labels have been used for a collection of traits that has come to be known as Attention Deficit Hyperactivity Disorder. Children who have some of these traits show them most of the time; the types, number, and level vary within each child from moment to moment and from situatio .....

.... These two subspecies have formed on different sides of the Tana River in Kenya. They are phenotypically distinct, and can only produce fertile offspring in zoos. Sympatric speciation occurs when two segments of the same species occupy a geographical area without interbreeding. Each new species, or subspecies, adapt to a specific environmental niche (adaptive radiation). Two segments of the same species Adapted to different niches An example of sympatric speciation is the genus Rhagoletis. These are a group of small flies whose larvae feed on developing fruit. The Rhagoletis pomonella is a species that feeds on ha .....

.... to , as it is caused by high insulin levels. This pigmentation normally occurs in areas of the body where flexing and bending occurs, such as the back of the neck.  Reddening of the skin or erythema. This is caused by localized irritation. Most often the areas of the body most affected are those such as the gluteal cleft, groin area, and other places that friction might occur. It is not limited to these areas as it occurs on any other part of the body as well, such as the extremities.  Pincer nails. This is where the nails of the feet and hands have an increased inward folding. This often gives the vis .....

.... this condition when they are as young as 40 years of age. However, the disease is most common in persons over the age of 65. It is estimated that approximately 10 percent of persons over 65 years of age may have and that in persons over the age of 85, up to 50 percent may be affected. is not a normal part of the aging process. It is not contagious, and it is not known how it can be prevented. While the physical changes in the brain are very similar among different people the behavioral and psychological symptoms that result are complex and may differ from person to person(Kawas, 80). These symptoms lead to a form of demen .....

.... varieties - indeed, new species - by crossbreeding between species. This is because hybrids are often polypoid. Polyploidy, as we know, can occur naturally in the wild. Some species of cotton that we grow are polypodies that probably arose originally by accidental crosses between different species of cotton. But breeders do not have to rely on accidents. They can attempt to produce fertile polypodies by crossbreeding between different species. One early attempt to produce another hybrid species was made in 1927 by the Russian geneticist G. D. Karpechenko, who crossbred two quite distantly related species, a radish and .....

.... is a very large, gram positive sporeforming rod. The organism is cultivated on ordinary nutrient medium and grows best aerobically, but can also multiply under anaerobic conditions. The disease, Anthrax, is very deadly but it is rare. The risk of infection is 1/100,000. The disease is acquired when spores from a contaminated animal carcass inoculate an open wound. Then, the spores germinate and invade the blood stream, leading to death within 48 hours. is classified as a harmful, pathogenic bacterium. There is a vaccine for Anthrax in humans, but it produces no significant immunity. The vaccine is given primarily to people who .....