... has large, pale eyes; a powerful yellow beak; and great, black talons. The distinctive white head and tail feathers appear only after the bird is 4 to 5 years old. Bald eagles are believed to live 30 years or longer in the wild, and even longer in captivity. They mate for life and build huge nests in the tops of large trees near rivers, lakes, marshes, or other wetland areas. Nests are often reused year after year. With additions to the nests made annually, some may reach 10 feet across and weigh as much as 2,000 pounds. Although bald eagles may range over great distances, they usually return to nest within 100 miles of where they were raised. Bald eagles no ...

... solid, because heat is given off by the substance in its change from the liquid to the solid state. Hence, the freezing point or melting point of a pure substance may also be defined as the temperature at which freezing or melting continues once it has commenced. All solids melt when heated to their melting points, but most liquids can remain liquid even though cooled below their freezing points. A liquid may remain in this supercooled state for some time. This phenomenon is explained by molecular theory, which conceives the molecules of a solid as being well ordered and the molecules of a liquid as being disordered. To solidify, a liquid must have a nucleus (a p ...

... habitat for many insects. Water is also one of the best solvents. The specific heat property of water stabilizes temperature in living organisms and its high heat of vaporization regulates earth's climate. One of the most unique things about water is the fact that it expands when it freezes unlike many other liquids. Its thermal and transparent properties protect aquatic life in freezing temperatures. All of these things combined help to sustain life and keep it constantly evolving. In the next couple of pages, we are going to go into detail of how it does this. Water consists of two hydrogen atoms that are joined to one oxygen atom by covalent bonds. These bo ...

... Hydrogencarbonate. 10 grams of Sodium Carbonate. A bottle of 2 molar HCL. Diagram. Method. Three grams of sodium hydrogen carbonate was weighted out accurately using a weighting bottle and a balance. Then thirty centimetres cubed of 2 molar HCL was measured using a measuring cylinder. The acid was then placed into the polystyrene cup and its temperature was taken and recorded using the thermometer. The pre-weighted sodium hydrogencarbonate was then added to the solution, and the final temperature was recorded. The contents of the cup were then emptied out and the cup was washed out with water and then thoroughly dried. This was done three times for the sodium ...

... we [must] exercise caution, and special concern for natural values in the face of such uncertainty and respect the 'precautionary principal'." - Ontario Minister of Natural Resources, 1991 The History of the Forest Forests have long been recognized as having vast power, both through their potential and how it has been viewed by humans, as well as through their effect on humans in sometimes subtle ways. The inherent properties of wood have always made it attractive as a versatile resource but there are other, more subtle ways in which it affects people. The tropical rainforests, responsible for producing most of the earth's breathable air, have been give ...

... is when the relationship between two animal populations becomes intimate and the individuals of one population use the other population as a source of food and can be located in or on the host animal or animal of the other population(Boughey 1973). No known organism escapes being a victim of parasitism(Brum 1989). Parasitism is similar to preditation in the sense that the parasite derives nourishment from the host on which it feeds and the predator derives nourishment from the prey on which it feeds(Nitecki 1983). Parasitism is different from most normal predator prey situations because many different parasites can feed off of just one host but very ...

... energy may be an alternative source of energy in the future. There are many things that we must take into consideration before geothermal energy can be a possibility for a human resource. I will be discussing some of these issues, questions, and problems. In the beginning when the solar system was young, the earth was still forming, things were very different. A great mass of elements swirled around a dense core in the middle. As time went on the accumulation elements with similar physical properties into hot bodies caused a slow formation of a crystalline barrier around the denser core. Hot bodies consisting of iron were attracted to the core wi ...

... human in 1990. They developed a protocol for treating Adenosine deaminase (ADA) deficiency, a severe combined immune deficiency, also known as the "Boy in the Bubble disease." ADA deficiency is a result of inheriting two copies of the defective ADA gene. Possession of a normal gene leads to the continuous, regular production of ADA in cells throughout the body. Without at least one properly functioning gene, children have no way of converting deoxyadenosine (a waste product) into inosine. This leads to the rapid build-up of deoxyadenosine in the system, which becomes phosphorlyzed into a toxic triphosphate, which kills T-cells. The result is an almost complete fail ...

... or whether we should utilize the eight we have," he says. Dr. Willard is currently negotiating with an American company to develop prenatal diagnostic tests, which, because the current tests are time consuming and technically difficult to do, are restricted to women over 35 and those who have a family history of chromosomal abnormalities. Prenatal tests using Willard's probes would be much simpler and faster to perform and could be available to all pregnant women who wish to take advantage of the technology. Current prenatal testing involves growing fetal cells in vitro and examining them, over one or two months, to see if there are two copies of a partic ...

... masses (200g and 249g), ruler, protractor, spring scale and triple beam balance were used. Each group has its own assigned mass and forces as well as a force table. Weight hangers were attached to two strings tied to the center ring of the force table, where two slotted masses, one 200g and the other 249g were hung according to their specified directions. The center ring was anchored to the nail positioned at the platform’s center while the upper ring of the spring scale was attached to the free end of the third ring. After attaching the spring balance, its hook was pulled and the reading on the scale and the direction of the pull at which the two forces (hangi ...