... that could be passed on to their offspring as inheritable traits. This generalized hypothesis of evolution by acquired characteristics was not tested scientifically during Lamarck's lifetime. A successful explanation of evolutionary processes was proposed by Charles Darwin. His most famous book, On the Origin of Species by Means of Natural Selection (1859), is a landmark in human understanding of nature. Pointing to variability within species, Darwin observed that while offspring inherit a resemblance to their parents, they are not identical to them. He further noted that some of the differences between offspring and parents were not due soley to ...
Words: 1798 - Pages: 7
... have been found in eastern africa and have been dated between 4.5 million and 1.1 million years old. There has also been evidence that the australopithecus "man" lived in australia where fossils have also been found. The first discovery of an australopithecus fossil was made in 1924. The body of the australopithecus is smaller than humans, but biffer than chimpanzees. Also, The brain size of australopithecus is bigger than humans at about 475 cubic centimeters. This is also biffer than the chipanzees, but the brains were not developed in most areas. For example speech. The australopithecus species all had mostly the same features with a low forehead, a "bo ...
Words: 306 - Pages: 2
... Between the years of 425BC-430BC Athens' population was dramatically reduced when about 300,00 of its inhabitants died from some sickness. Some people now believe that this great plague was really Ebola. The first recorded outbreak of the Zaire string of the Ebola virus was in Zaire, in 1976. The doctors didn't know how to treat it and that meant that they didn't know how to contain it either. As infected people met in public places the virus spread. In Western Sudan, the same year, the Sudan string of the Ebola virus emerged with similar results. Both casts together had about a total of 550 infections and around 340 deaths (about 60% death r ...
Words: 1098 - Pages: 4
... was introduced, some germs were already naturally resistant to the drug. As we used more and more of the antibiotics, we incidentally caused drug-resistant germs to progress. So, even if you’ve never misused antibiotics, you could still become infected by bacterium most drugs won’t kill. For each drug, there are germs genetically programmed to survive- some w/ outer walls tough for antibiotic to cross, others with ways to dump the drugs back out before they can work, and yet others can inactivate the antibiotic. Even worse, by passing tiny packets of genetic material to other bacteria, these survivor germs sometimes also pass the formula for resista ...
Words: 1749 - Pages: 7
... first discovery. Its name came from Pluto, the planet after Neptune for which Neptunium was named. In 1940, at the University of California at Berkeley, he bombarded a sample of Uranium with deuterons, the nuclei in atoms of deuterium, transmuting it into plutonium. Shortly after, Seaborg was able to isolate plutonium 239, an isotope used in atomic bombs. Plutonium is a highly dangerous and poisonous element because it rapidly gives off radiation in the form of alpha particles. Alpha particles, which are identical to the nucleus of a helium atom, consist of two protons and two neutrons tightly bound together. Although the particles can only travel about five cent ...
Words: 835 - Pages: 4
... find that these elements have a lot of unpaired electrons, in the case of iron, Fe, there are four. What happens then in the case of a natural magnet the unpaired electrons line up or the magnet in a specific mannor. That is all the atoms with unpaired electrons moving in a direction which causes a certain charge are lined up on one side and all the atoms with the opposite charge move to the other side. The atoms then start to cancel each other out as they approach the center of the magnet. This all happens at the currie point where these atoms are free to move and then when cooled and the metel becomes solid the atoms can no longer move (barely) causing a "per ...
Words: 2864 - Pages: 11
... claimed to have FAE, or fetal alcohol effects. The sad thing is that most infants and children who suffer from fetal alcohol effects go unnoticed. They are looked upon as having behavioral problems. Because of this lack of recognition the treatment of their problems are mishandled which creates a very difficult and confusing childhood for these children. (McCreight, 1997). Even when fetal alcohol effects are recognized there is limited treatment. There are hardly any programs in schools and society to help the children maintain normalcy. It was not until 1973 that the deficit was first acknowledged and given a name. Nearly thirty years later we are still ...
Words: 764 - Pages: 3
... We recognize this process as burning. The individual relies on food for fuel which contains energy-giving substances that our bodies can store until we need this energy to use our muscles. When we do use our muscles within us, we may not always be sure that heat is given off. Our bodies do not burst into flames but the perspiration on our skin is a clue to what is happening. The movement of the windsurfer has a different explanation. The windsurfer is propelled along by a sail which collects from the winds that sweep along the water. This energy has been produced by the sun which warms the earth's surface and sets the air above in motion. The sun's heat co ...
Words: 506 - Pages: 2
... the animal kingdom. Estimates range from 1500 to 2200 different mantid species WORLDWIDE. The most common figure given, though, is about 1800. The ways the Mantid's are classified in the Animal Kingdom. There is agreement that the collection of mantid species make up the Mantidae family of insects. The Mantidae family, in turn, is part of the order/suborder Mantodea that includes a variety of mantid-like species. But the existing literature does not reflect a clear consensus about what insect order Mantodea belong in. Some have placed Mantodea in the Dictyoptera Order-with the roaches. Others place Mantodea in the Orthoptera Order-with crickets and grasshopper ...
Words: 3360 - Pages: 13
... that allow both powered flight and the generation of violent jumps." The Demodus rotundus demonstrates intricate movements including flight-initiating jumps and because of this the wing is expected to be engineered for the ability to jump (to initiate flight) and also powered flight. The prediction that was made for this experiment was that this experiment would follow the results that were observed by Altenbach in 1979, and 1988. That is, that the bat would indeed initiate its flight with a jump. The tests that were imposed were the use of a force platform with twelve transducing elements. There were two horizontally oriented aluminum box beams holding ...
Words: 516 - Pages: 2
