.... is used in medicine as a laxative. Magnesium is also used in artificial limbs, vacuum cleaners, snow skis, wheelbarrows, and lawn mowers. In 975AD calcium was useful for setting broken bones. There have been many uses for calcium over the years, but calcium has not been available on a large scale until the twentieth century. Calcium is a metallic element, which is fifth in abundance in the Earth’s crust. It is essential for forming leaves, bones, shells, and Portland Cement. Calcium occurs in many highly useful compounds such as marble, limestone, and chalk. Plants and animals must have calcium to live. A plant cannot grow without a good s .....

.... theory, which I will discuss in greater depth later.  Whether or not there is a catalyst. A catalyst speeds up the rate of reaction and remains chemically unchanged by the end of the experiment. A catalyst lowers the activation energy. This is the energy needed to start a reaction. The variable that I have decided to change is the temperature. I have decided to alter the temperature of the yeast and time the amount of carbon dioxide that will be given off at different temperatures. I have decided to time how much carbon dioxide is given off in five minutes. Throughout the investigation, I will keep the temperature the sa .....

.... For the most part in Missouri, employment is increasing. Nevertheless, if you are not restricted to finding a job in Missouri, in the United States a whole employment is expected to increase 21% (Choices). After finding a job in the chemistry field that you will enjoy another quesiton arises, money. On hte average if you begin working at a entry level job witha bachelors degree your salary will be somewhere around $24,000 a year. If you start work with a masters degree you can expect about $32,000 and with a Ph.D. as mcuh as $60,000 ("Chemists") Research and development is the subcareer most chemist choose. In this subfield your pri .....

.... company communicating with the producer of a product during any period of time. The provides all the functions listed in the previous statements. Also, the provides an opportunity to define an organization and display it to everyone to see. Furthermore, is not a new product that has just been recently introduced in the market. However, it just has not been widely used until the past few years. People use everyday without knowing that they are using it. , therefore, is the client/server, PC, Unix, Apple and many other applications that one has been using on his/her work. Security on the Internet is just as hazardous as the . Any leakage of infor .....

.... a similar structure to the adenosine group, but also has more heavily electrophilic and nucleophilic functional groups than adenosine as, for instance, seen in cyclic AMP. This means that caffeine will fit adenosine receptors as well as adenosine itself will. Thus, cyclic AMP remains active, rather than being broken down. Second among the effects of caffeine is phosphodiesterase inhibition. The phosphodiesterase class of enzymes includes a number of enzymes responsible for breaking down cyclic AMP, thus depriving the body of an energy supply. Caffeine fools phosphodiesterase into attacking it instead, which inhibits the breakdown of cyclic AMP. How .....

.... and sea urchins became extinct. Paleontologists have proposed scenarios that could have caused these extinctions. One such scenario involves the growing number of small mammals which ate dinosaur eggs, and therefore caused the dinosaurs' birth rate to drop. The birth rate became smaller than the death rate and the dinosaurs died out. This, however, is not a plausible scenario. This would only account for the dinosaurs, but not all the other creatures of that time. Paleontologists needed to come up with a more plausible and devastating theory that would include the other creatures that died out 65 million years ago. There have been several major .....

.... plants or animals, fungi are called parasites. When they get it from dead plant or animal matter, they are called saprophytes. Fungi are very widely distributed throughout the world, particularly in the temperate and tropical regions where there is sufficient moisture for them to grow. They are less likely to be found in dry areas. Some few types of fungi have been reported in Arctic and Antarctic areas (some molds, after all, thrive on refrigerated food). There are about 50,000 known species of . Although any single typical may not be uniform in appearance--a mushroom, for example, has a cap, stem, and rootlike components--it has, in fact, a u .....

.... already occur. Air Pollution Factories and transportation (like cars or planes) depend on huge amounts of fuel every year. When these fuels burn they introduce smoke and other, less visible, by-products into the atmosphere. Although wind and rain occasionally wash away the smoke given off by power plants and cars, the cumulative effect of air pollution poses a grave threat to humans and the environment. In many places smoke from factories and cars combines with naturally occurring fog to form smog. Smog has been long recognized as a potential cause of death, especially for elderly persons and those with severe respiratory ailments (like asthma). Ai .....

.... One variety of vitamins is the Vitamin A. This group includes retinol and carotene. Carotene is a yellow pigment found in vegetables such as carrots. A diet that is lacking in Vitamin A depreciates a person’s ability to see in the dark. Which is where the saying that carrots will make you see better is derived from. Carrots were the vegetables chosen to be tested in this experiment. This experiment was designed to test if the processing of a carrot produces gas. In turn discovering the health related differences of canned, frozen and fresh carrots. Canning is a process of hermetically sealing cooked food for future use (Encyclopedia.com, 1999). Thi .....

.... more research is still needed to discover and fully understand (Loftus p. 392). Memory is broken down into three systems or categories . These different systems are sensory memory , short-term , and long-term memory. Sensory memory is the shortest and less extensive of the others. It can hold memory for only an instance (Memory p. 32). Suppose you see a tree , the image of the tree is briefly held by the sensory memory and quickly disappears unless you transfer it to your short-term memory (Rhodes p. 130). The next level is called short-term memory. The image or fact can be held as long as the brain is actively thinking about it (Loftus p. 392). For .....