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Search results 2611 - 2620 of 7924 matching essays
- 2611: The Superstring Theory
- ... nine space and one time), and that each of them has a consistent description in terms of maintaining "intelligibility." The five theories, are type I, type IIA, type IIB, E8 X E8 heterotic (HE, for short), and SO [32] heterotic (HO, for short). The type II theories have two supersymmetries in the ten-dimensional sense, while the other three have just one. The type I theory is special in that it is based on unoriented open and closed ...
- 2612: Evolution
- ... for limited resources - the "missing piece" to his puzzle6. For fear of contradicting his father's beliefs, Darwin did not publish his find! ings until he was virtually forced after Alfred Wallace sent him a short paper almos t identical to his own extensive works on the theory of evolution. The two men presented a joint paper to the Linnaean Society in 1958 - Darwin published a much larger work ("a mere ... those species evolving from ancestors already present in the area. Because the evolutionary process is so slow, spanning over considerable lengths of time, it can be predicted that similar species would be found within comparatively short distances of each other, due to the difficulty for most organisms to disperse across an ocean. These patterns of dispersion are rather complex, but it is generally maintained by biologists that closely related species occur ...
- 2613: Alchemy
- ... ideas, especially those connected with spiritual contact. The object of modern alchemy might be reduced to the search for a substance having the power to transform and transmute all other substances into one another - in short, to discover that medium so well known to the alchemists of old and lost to us. This was a perfectly feasible proposition. In the four principal substances of oxygen, hydrogen, carbon, and azote, we have ... the most precious metal, but when circumstances were not favorable the baser metals resulted. The desire of the old alchemists was to surprise nature`s secrets, and thus attain the ability to do in a short period what nature takes years to accomplish. Nevertheless, the medieval alchemists appreciated the value of time in their experiments as modern alchemists never do. M. Figuier`s friend urged him not to condemn these exponents ...
- 2614: Invertebrate vs Vertebrate
- ... and leaping, their predominant forms of locomotion. Their long tails, thickened at the base, are used for balancing; kangaroos frequently "go on all fives" when foraging. Each long, narrow hind foot has four toes. The short forelimbs are used almost like human arms, but the thumb is not opposable. Kangaroos possess soft, wooly fur, and some have stripes on the head, back, or upper limbs. All kangaroos have a chambered stomach ... flyer, M. rufus. The best-known species, the gray kangaroo, is found mostly in open forests of eastern and southwestern Australia and Tasmania. It is long-haired and silvery gray in eastern coastal regions but short-haired and dark gray inland. The red kangaroo, which is found throughout Australia's interior grasslands, is the largest and most powerful species. A male may attain a head-body length of 1.5 m ...
- 2615: The Shrew
- The Shrew One of the smallest mammals is the shrew. It has a snout that is long and pointed, the small ears are coverd with short fur, it eyes small, and its tail is never more than twice as long as back foot. The shrew has short thick fur, its upper boddy is olive-brown and lighter on its stomach. its usaly 79mm long, its tail is 18 mm long, and its weight is around 4-7 1/2g. The shrew lives ...
- 2616: The Monkey
- ... plantigrade fashion (the entire sole of the foot touching the ground); but they are capable of sitting upright and sometimes standing erect, and consequently their hands are freed for many manipulative tasks. Most have a short, relatively flat face without great prominence of the muzzle (excepting the baboons and drills). The hands and feet are prehensile, with, typically, five digits on each, the first (thumb and big toe) being divergent from ... teeth are present above and below on each side of each jaw, but the skull is provided with a bony auditory passage. In none of the catarrhines is the tail prehensile; it may be long, short, or lacking. All Old World monkeys have hard patches of naked skin on the buttocks (ischial callosities). In this they differ not only from the New World monkeys but also from the great apes. Monkeys ...
- 2617: Creation, Evolution and Intervention: Which Theory is Correct?
- ... of no preexisting material".(Dickey 237) In the bible and in other comparable ancient literature, creation is a theme used to explain how human beings came to earth. In the bible and most other creation stories from ancient religions, the universe is said to be a great mess in which order was introduced by a God. In the bible, it states that the creator cleaned up the world and organized everything such as the stars and the day from night. In many ancient cultures the stories tend to be similar and differ only in terms of places and figures. Other ideas of creation include myths of emergence. According to the bible, earth, all of its species and the universe were created ...
- 2618: Thoeries of Evolution
- ... an order of mammals, the primates, which existed before the dinosaurs became extinct. Early primates seem to have been tree dwelling and may have resembled squirrels in their habitats. Many of the primate attributes, the short face, overlapping visual fields, grasping hands, large brains, and even alertness and curiosity, must have been acquired as arboreal adaptations. Descent from tree habitats to forest floors and eventually to more open country, however, was ... climatic change and volcanic activity. Whatever proposals may eventually prove true, however, it seems fairly certain that periodic waves of mass extinction do occur. Species adapted to live in environments that are changeable in the short term have broad tolerances, which may better enable them to survive extensive changes. Human beings are uniquely adapted in that they make and use tools and devices and invent and propogate procedures that give them ...
- 2619: The Effects of UFO's on People
- ... of extra terrestrial sightings can have an adverse effect on people if influenced the wrong way. No solid proof has shown that UFO's are real, but many sightings cannot be proven otherwise. The media, stories, or one's own experience may often influence what one believes. The government once stated that they had captured extra terrestrials. (60 minutes, CBS) On the contrary, most scientists now agree that almost all sightings and stories of extra terrestrials are not authentic. The United States government has records of thousands of UFO sightings since 1948, including photos of alleged UFOs and interviews with people who claim to have seen them. Since ...
- 2620: Water Biomes
- ... marshes are best developed on the Atlantic coasts of North America and Europe. In eastern North America the low marsh is dominated by a single species, salt-marsh cordgrass. The high marsh consists of a short cordgrass called hay, spike grass, and glasswort. Glasswort is the dominant plant of Pacific Coast salt marshes. Freshwater marshes provide nesting and wintering habitats for waterfowl and shorebirds, muskrats, frogs, and many aquatic insects. Salt ... the beach and retreats with the tides. Among the sand grains live small copepods and worms that feed on microscopic algae, bacteria, and organic matter. On the lower beach, which remains uncovered for only a short period of time, live clams, crabs, starfish, and sand dollars, whose calcareous skeletons lie partially buried in the sand.
Search results 2611 - 2620 of 7924 matching essays
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