.... primitive tetrapod. It is very close to its fish ancestry, but still anatomically far from its terrestrial relatives. These creatures still lived in water, but they had a lot of the terrestrial tetrapod anatomical characteristics. Introduction: Before tetrapods existed, all vertebrates were confined to living in aquatic habitats. The only animals that lived on land were arthropods. Through natural adaptations, the fish developed into amphibians. This colossal stage of change made necessary the evolution of new ways of breathing, locomotion, and reproduction. Paleontologists needed to unders .....

.... in the past between some mayors and public officials who favor public expenditures to hold back the sea and other public officials and some scientists who are skeptical about erosion-fighting programs. There were those who believed people should not be allowed to rebuild in hazardous areas and those who would not forbid them to build as long as they did not ask for recompense when they got into trouble. One group has felt property owners should not be compensated if they are forbidden to rebuild, and others say it is unconstitutional to take property without compensation. The .....

.... HIV is the virus that causes AIDS. HIV is classified as a RNA Retrovirus. A retrovirus uses RNA templates to produce DNA. For example, within the core of HIV is a double molecule of ribonucleic acid, RNA. When the virus invades a cell, this genetic material is replicated in the form of DNA . But, in order to do so, HIV must first be able to produce a particular enzyme that can construct a DNA molecule using an RNA template. This enzyme, called RNA-directed DNA polymerase, is also referred to as reverse transcriptase because it reverses the normal cellular process of .....

.... To think otherwise is to embrace a belief in genetic determinism—the view that genes determine everything about us, and that environmental factors or the random events in human development are utterly insignificant. The overwhelming consensus among geneticists is that genetic determinism is false. As geneticists have come to understand the ways in which genes operate, they have also become aware of the myriad ways in which the environment affects their "expression." The genetic contribution to the simplest physical traits, such as height and hair color, is significantly media .....

.... hominines reveals several biological and behavioral trends characteristic of the hominine subfamily. Bipedalism Two-legged walking, or bipedalism, seems to be one of the earliest of the major hominine characteristics to have evolved. This form of locomotion led to a number of skeletal modifications in the lower spinal column, pelvis, and legs. Because these changes can be documented in fossil bone, bipedalism usually is seen as the defining trait of the subfamily Homininae. Brain Size and Body Size Much of the human ability to make and use tools and other objects stems from the large size .....

.... by Galileo. Thus "the apple that fell from the tree" fell to Earth at about this rate. For the first basic explanation of this we will assume a linear plane, one in which all forces act in only one direction. Therefore when the apple fell it went straight towards the center of the earth (accelerating at about 9.8 meters per second second). Newton then figured that the same force that pulled the apple to Earth also pulls the moon to the earth. But what force keeps the moon from flying into the earth or the earth flying into the sun (Edwards 493)? To better understand this, one other aspe .....

.... of a typical adult hermit crab. After reaching the adult larvae stage, the hermit crabs begin looking for a shell to live in. Once they mature and find a suitable shell, they come to live on land for the rest of their lives. Hermit crabs grow on land by shedding their exoskeleton. It takes about ten days for a hermit crab's skin to harden after molting. Shedding is a necessary part of their livelihood since they will grow back missing legs during this time. In the wild, hermit crabs can live up to 25-30 years. But normally in captivity they live around 1 year. Hermit crabs can eat a variety .....

.... t appearance of abundant fossils especially Trilobites, which characterizes a succeeding point in time. During the Cambrian Period the lapetus Ocean appeared, the predecessor of the Atlantic Ocean, which separated the young North American and Eurasian continents. Also Gondwanaland was in the final stages of development. Gondwanaland was a very large continent made up of what is now South America, Africa, Arabia, Madagascar, India, Australia, and Antarctica. Large shelled organisms first emerged during the Cambrian. Also Earth¹s atmosphere contained the same amount of oxygen as it d .....

.... even than this. In many cases, including the Crab nebula supernova, the stellar remnant left behind after the explosion is a NEUTRON STAR--a star only a few kilometers in diameter having an enormously large density and consisting mainly of neutrons--or a PULSAR, a pulsating neutron star. There are two common types of supernovas, called type I and type II. Type I occurs among old stars of small mass, whereas type II occurs among very young stars of large mass. It is not known how a small-mass star can release the very large amounts of energy needed to explain type I supernovas .....

.... Bathurst Bay killed 300 people but didn't reach land). Cyclone Tracy hit the coastal city of Darwin on Christmas Day 1974. Although people had warning on New Year's Day about Cyclone Tracy, they were busy preparing for Christmas and thought that the cyclone would pass away just like Cyclone Selma had done three weeks before. Cyclone Tracy came roaring down the Arafura Sea (where most the develop in that area) and was on track to bypass Darwin but changed direction 900 past Melville Island and straight towards the city. At this time most people were asleep or partying. By 1:00 AM, the c .....