.... lasts about 50 days (Patent 54). The second stage, in which the hind legs grow, is called “prometamorphosis,” and lasts about 21 days. When the legs are about as long as the body, the third stage, which is called “ metamorphic climax,” and takes place very rapidly, begins. During this last stage, which lasts about a week, many great changes occur. They lungs complete their development, and the gills disappear. The skin gets thicker, nostrils form, and the tail is completely resorbed. Most frogs prefer moist regions, and many kinds live in the water. Because frogs absorb oxygen in water through their skin, .....

.... and a self-educated person who was accredited for finding by means of a timekeeper. John built his first pendulum watch in 1713. It was constructed entirely out of wood. Harrison called his first sea clock Harrison’s No. 1 or H-1 for short. H-1 was bar-shaped, built out of shinny brass, and was big in size. His second attempt was called H-2. H-2 was a heavy weight of 86 pounds, but fitted into a small box as John promised it would. H-2 was also bar-shaped and included an implement to ensure a unchanging drive and a more agreeable temperature reimbursement device. Although its motion was adequately regular and e .....

.... to its end. This strand grows inward towards the replication fork as the DNA molecule unzips. This strand ends with a hydroxide (OH) group and is called the 3` prime or 3`end. The enzyme that catalyzes this process is called DNA polymerase. The second strand is built by having a polymerase jump ahead on the strand and fill in the complementary nucleotides backwards. This strand moves in the outward direction, hence away from the replication fork. The DNA polymerase for this strand starts a burst of synthesis at the point of the replication fork. The addition of nucleotides to the 3` end of a short new chain until this new segmen .....

.... and the symptoms of depression occur. In Clinical depression the chemicals in the brain are out-of-balance. New technology allows researchers to take pictures of the brain that show activity levels in the brain. These imaging techniques such as f-MRI and PET scan actually create images of how active different parts of the brain are. Some studies with these kinds of techniques have suggested that the patterns of activation in the brains of depressed people are different than those who are not. These tests can help doctors and researchers learn more about depression and other mental illnesses. Since this research is fairly new, i .....

.... and the Biuret test for amino groups present in proteins. The last part of this lab takes an unknown substance and by the four tests, determine what the substance is. BENEDICT'S TEST Introduction: Monosaccharides and disaccharides can be detected because of their free aldehyde groups, thus, testing positive for the Benedict's test. Such sugars act as a reducing agent, and is called a reducing sugar. By mixing the sugar solution with the Benedict's solution and adding heat, an oxidation- reduction reaction will occur. The sugar will oxidize, gaining an oxygen, and the Benedict's reagent will reduce, loosing an oxygen. If the .....

.... 50's, however, LSD was used by the CIA as an interrogation drug for spies. However, it was proven to be unreliable and was later replaced with other interrogation drugs. LSD comes in the forms of crystals, liquids, tablets, gelatins, or blotting squares. The squares have designs on them such a flowers, dragons, shapes, animals, and cartoon characters to make them more attractive to young children. Often called acid, white lightning, stamps, microdot, and grateful dead, LSD is usually taken orally. There are 4 levels of experience an LSD user will go through. The first takes place within 45 minutes of ingestion. The user be .....

.... to the Appalachian Mountains."(Gottschalk 1) The blast of the impact would equal a 300 gigaton blast of T.N.T. Also, 2.4 seconds after impact, a small fireball with a temperature of 5000'C would sweep across long island. A land fall strike would cause total divistation. The asteroid would create a earth trembling impact causing earth quakes around the world. The binding flash will show impact and the crater would be twenty miles across. Then, a blanket of dust and debris would blanket the earth and block the sun's light. This would occur for hundreds of years and the climate would be disrupted. Global killer no matter where it hit .....

.... has temperature ranges between one hundred eighty and two hundred fifty kelvins. Finally, the thermosphere is the final level in the atmosphere. It's range is eighty- five to one hundred forty kilometers and also temperatures as high as four hundred sixty kelvins. Society has been widely addressed with the many problems that we are having in our environment today. A major problem is that of CFCs. CFC stands for Chlorofluorocarbons which are found in many of the aerosol spray cans. In December of 1973, Rowland and Molina discovered that CFCs can destroy the ozone in the stratosphere. In June 1975, the Natural Resource .....

.... circadian rhythm. In the temperate zones, day lengths during the natural 24-hour cycle vary with the seasons. In winter and spring, the period of light lengthens; in summer and autumn, it shortens. Plants in these zones undergo alternate 12-hour phases of light sensitivity. During one 12-hour phase, decreasing exposure to light induces a short-day reaction. For example, deciduous trees under the influence of the shorter days of fall drop their leaves. During the other 12-hour phase, more exposure to light creates a long-day reaction. Deciduous trees grow leaves again during the lengthening days of spring. This ind .....

.... this so-called Hubble expansion exists throughout the observable universe. This shows three important things. First there is no significance to the fact that earth seems to be the center of the universal expansion. In any galaxy it would look as if you were standing still and all others were rushing away from you. Second the movement of the universe is not like an explosion. Galaxies are not moved through the universe but expand with the universe. Third the galaxies themselves do not expand only the space between them. Finally if you ask where the expansion started the only answer is everywhere. In the words of .....