.... family groups sometimes up to herds of 15-20. After a gestation of up to 6 months, usually a single pinkish calf is born. Manatees ferquently communicate by muzzle to muzzle contact and when alarmed they emit chripy squeaks. The number of manatees has been reduced over the past several years due to heavy hunting for their hides, meat, and blubber oil. Some governments, including the United States, have placed the manatees under the endangered species list. One practical reason for this is that they have proved useful in clearin girrigation and transport channels clogged .....

.... too, may be this same object but in still another state. The everyday world is made of molecules. Because molecules are so small, their existence was not easy to establish. Indirect evidence for molecules was strong during the second half of the 19th century, and the first explicit evidence was found when Brownian motion was correctly understood and studied in about 1906 by physicists Albert Einstein and Jean-Baptiste Perrin. There are many kinds of molecules, and it was clear that simplifying ideas were needed. The Russian chemist Dmitri Mendeleev argued that there was a set .....

.... conditions, the trade winds blow towards the west across the tropical Pacific. These winds pile up warm water in the west Pacific, so that the sea surface is about 1/2 meter higher at Indonesia than at Ecuador. The sea surface temperature is about 8 degrees C higher in the west, with cool termperatures off South America, dut to an upwelling of cold water from deeper levels. This cold water is nutrient-rich, supporting high levels of primary productivity, diverse marine ecosystems, and major fisheries. Rainfall is found in rising air over the warmest water, and the east Pa .....

.... soil contains few nutrients, which is why attempting to grow any sort of crops would be futile. On top of this soil is a thin layer of humus, which simply said is the compost made from the millions of dead animals and plants of the forest. When things such as leaves and animals die their remains are quickly broken down by a limitless amount of tiny organisms. Some insects that do just this sort of thing include: beetles, ants, termites and a host of others. With all of this death happening so quickly you would expect a sort of rotten smell to be in the air. This, however, is .....

.... it myself. From what I have researched I have come to understand that currently is very “Hit or Miss”(Hawley). From 277 attempts, Dolly was the only successful attempt. The point is however that we now have a man created sheep, what else could be done in the near future. There are many different goals for genetic . Would you like to clone someone close to you who had died? In the movie “Gattaca” you get a peak at something that could be made possible by , the genetic engineering of children not yet born. It could be the end of birth defects. If given the choice to be able to .....

.... deeply into the brass. This led Mr. Thompson to the conclusion that heat was the product of work, not the invisible fluid caloric. Joseph Black, yet another scientist of the seventeen hundreds, discovered that it took different substances varying amounts of heat to raise one gram of a substance one degree Celsius. He called this specific heat. Mr. Black also noticed that when mercury at fifty degrees is mixed with equal amounts of water at zero degrees the resulting mixture would be only one degree. From this, he concluded that heat and temperature were not the same. In .....

.... to man - made chemicals ( Bowermaster et al, 1990, p.27 ). If enough of these man - made chemicals are released, " the ozone layer would be weakened to such an extent that it does not filter out the sun's invisible and dangerous ultraviolet rays " ( Jones, 1992, p.36 ). Such a scenario would drastically alter society and the environment. Ozone depletion has been described as " potential catastrophe " and " a planetary time - bomb " ( Way, 1988, p.9 ). The four main areas affected by a depleted ozone layer and thus by the corresponding increase in harmful ultraviolet radiatio .....

.... flows of lava into the sea which have not had time to collect sediment. Life on the rocky shores is separated into distinct zones that reflect the length of time each is exposed. At the highest point on the rocks is the black zone, marked by blue-green algae. This transition area between land and the marine environment is flooded only during the high spring tides. The algae, enclosed in gelatinous sheaths to resist drying, are grazed on by periwinkles, which are protected under tightly sealed, conical shells. Below the black zone lies the white zone, where barna .....