PAPER Topics

... 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 with aquatic plant life. There has also been an increase in manatee death due to passing boats that speed through channels. If we all do not help protect these sea cows today then they will not be around for futur ...

... molecules from one cell to another. Groups of two or more tissues that function together make up organs. An organ system is a group of organs that work together to carry out major life functions. Eukariotic Cell Structure: Boundaries and Control: Plasma Membrane - The plasma membrane is sometimes called the cell membrane, or the cellular membrane. It is the outermost part of the animal cell, and it's purpose is to enclose the cell, and change shape if needed. The cell membrane is capable of allowing materials to enter and exit the cell. Oxygen and nutrients enter, and waste products such as excess water leave. The plasma membrane helps maintain a chemical balance within the cell. ...

... that astronomers are trying to answer is why isn't the black hole at the center of the galaxy? According to images from the Hubble Space Telescope, the black hole is 20 light-years from the center of the galaxy, but since the black hole is so massive it is hard to explain how it could have been moved. One idea is that the black hole is moving itself. Some astronomers think that the disk of dust serves as a "fuel tank." The black hole sucks in the material which is absorbed by gravity, compressed, and heated to tens of millions of degrees. This theory would explain why radio telescopes have observed radio jets, or hot gas exhausts from the black hole's area. The exhaust may be pushing ...

... conditions are generally smaller and have less photosynthetic surface areas. Hypothesis: Alternative Hypothesis: states the hypothesis being tested in this experiment. Photosynthetic structures of plants adapted to arid environments have a lower surface area to volume ratio than plants adapted to less dry or moist environments. Null hypothesis: there are no differences between the wet and dry habitat plants and observed differences are purely a result of chance. The null hypothesis is formulated to be rejected. Methods: The methods used to gather data for this experiment were fairly simple. Three plants from an arid environment and three from a moist environment were gathe ...

... to perform and even harder task, choosing a major. It's very difficult to decide what you want to do with the rest of your life in just a short time. I had the plans of working in the woods, so I talked with some friends who work with wildlife conservation and they told me parks and recreation was the way to go. After this strenuous research, I was very glad to get it over with. Another time I used research was when I restored my car. When I bought the rusty seventy Chevelle convertible, I thought there was no hope for it. I had little experience with restoration of vehicles and figured it would take ages to finish. I decided to write to some places and talk to people to boost my know ...

... fuel, which is one of the most abundant chemicals in the universe, and oxygen from the air are electrochemically combined in the to produce electricity. Heat and pure water vapour are the only by-products of the . The Ballard Fuel Cell is made up of two electrodes, the anode and the cathode, separated by a polymer membrane electrolyte. Both the anode and the cathode are coated in a thin layer of platinum catalyst. At the anode, hydrogen fuel is changed into free electrons and protons. The free electrons are sent in the form of usable electric current through an external circuit. The remaining protons are sent through the membrane electrolyte to the cathode where they combine with o ...

... and water. Yet even its short-lived life, it has found many functions within the body. Nitric oxide enables white blood cells to kill tumor cells and bacteria, and it allows neurotransmitters to dilate blood vessels. It also serves as a messenger for neurons, like a neurotransmitter. The compound is also accountable for penile erections. Further experiments may lead to its use in memory research and for the treatment of certain neurodegenerative disorders. One of the most exciting discoveries of nitric oxide involves its function in the brain. It was first discovered that nitric oxide played a role in the nervous system in 1982. Small amounts of it prove useful in the opening o ...

... as the ice edge retreated, and North America inherited a fertile soil base. Soil type is an important factor for which species of trees can thrive in an area. The general dominant tree species for temperate deciduous forests are Beech, Ash, Oak, and in our region also Tulip, Maple, Birch, and Hickory. Developed forests consist of four layers. The layers are: canopy, sub canopy, shrub, and ground cover. This layering affect benefits the diversity of the ecosystem by providing a rich variety of habitats. It is a result of adaptation and competition for sunlight and shows the continuing process of succession. The stratification of a forest, by intercepting the some of the available sunlight ...

... of Lead ( Howter, 1996, Radiometric Dating: An Exercise in Faith). As it turns out, this is what scientists believe to be. The assumption that the earth is 4.5 billion years old has raised doubts in the minds of some skeptics who question the accuracy of the data used in radiometric dating! They claim that without knowing the exact amount of Uranium in the beginning, most of the calculations will be based on assumptions and if one is to assume the amount of Uranium that existed 4.5 billion years ago, then, there is a chance that calculations would not yield an accurate result, because the initial data is assumed and it is not concrete. Another problem that radiometric dating faces is t ...

... CFCs have also been blamed for ozone depletion. CFCs are suspected of breaking down ozone particles that shield us from the sun's ultraviolet rays. Too many ultraviolet rays can cause cataracts and skin cancer. A hole in the ozone has been discovered over Antarctic the size of the United States. The hole is actually where the ozone has been depleted or thinned by the CFCs. The use of aerosol cans accounts for most of the release of CFCs. This resulted in the United Stated as well as other countries outlawing the use of these harmful chemicals in aerosol cans. Experts think that CFCs can stay in the atmosphere at least three hundred years. In order to slow the greenhouse e ...