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Free research essays on topics related to: extinction

74 results found, view free essays on page:

  • Ice Age Extinctions Of The Megafauna
    1,675 words
    ICE AGE EXTINCTIONS OF THE MEGAFAUNA During the last Ice Age before humans arrived, the North American continent belonged to various forms of enormous, fantastic creatures. By the end of the Ice Age, most of these large animals had become extinct. Numerous attempts have been made to explain the disappearance of these animals, but there has yet to be a consensus. Among the theories that have been debated, two are predominant. They are the climatic change theory, and the overkill theory. The clima...
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  • Ice Age Extinctions Of The Megafauna
    1,668 words
    ... vironments than do smaller animals. Larger animals are safer from predators than small animals are, but it is also harder for them to sustain in trying conditions. Many of the larger animals such as mammoths and bison travel in herds, and that, along with their large size, protects them from predators. However, when the predator is Mother Nature, there is virtually no defense. For modern day elephants, drought is the biggest concern. It can take twenty percent of a herd every year, but the e...
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  • Plants And Animals Rain Forests
    1,046 words
    Rain forests occur throughout the world where both heavy rains occur and where forests grow. By definition, a rain forest needs to receive more than eight feet of rain annually. Rain forests cover seven percent of the Earths land surface, and two percent of its total surface. Although they cover only a small portion of the Earth, rain forests are home to over fifty percent of the worlds plants and animals. Rain forests are concentrated around the equator, occurring between the Tropics of Cancer ...
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  • H 2 O Rate Of Reaction
    1,374 words
    Title: The Effects of Substrate Concentration and Temperature on the Rate of Hydrolysis of the Enzyme Trypsin. Abstract: Quantitative measurements can relate both temperature and substrate concentration to the enzymatic activity of trypsin. By analyzing the data, it is suggested that at BAPNA concentrations below those corresponding to Vmax are rate limiting, as less active sights are available for adhesion. The values of Vmax and Km relate a temperate catalytic efficiency of trypsin. The temper...
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  • Giant Panda Human Action
    1,142 words
    Biodiversity is the measure of variety of the Earth's animal, plant and microbial species; of genetic differences within species and of the ecosystems that support those species. The term first came to public attention in 1992 at the Rio Earth Summit at which a convention for the preservation for the maintenance of biodiversity was signed by over 100 world leaders [excluding the USA as they feared it would undermine the patents and licences of US biotechnology companies] The maintenance of biodi...
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  • Theory Of Natural Selection
    1,026 words
    Charles Darwin revolutionized biology when he introduced The Origin of Species by Means of Natural Selection in 1859. Although Wallace had also came upon this revelation shortly before Origins was published, Darwin had long been in development of this theory. Wallace amicably relinquished the idea to Darwin, allowing him to become the first pioneer of evolution. Darwin was not driven to publish his finding, which hed been collecting for several years before Wallace struck upon it, because he had...
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  • Living Organism Human Beings
    889 words
    Preservation of Biodiversity Human beings have inhabited Earth for just a blink of an eye. Almost any ecosystem can provide resources valuable to humans. 'However, recent reports show that approximately 40 percent of the earth's land surface has been altered by humanity'; (Becher). These altered surfaces have provided communities for humans, but the process has destroyed many native species and ecosystems. Global biodiversity is currently in danger. Estimates vary in how fast a species becomes e...
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  • Dominant Male Social Structure
    1,760 words
    Orangutans (Pongo Pygmaeus) Man of the Forest Origins The word Orangutan consists of two Malaysian words Oran (person) and Human (forest). Orangutans belong to Primates order of Hominidae family. In Latin, they are referred to as Pongo Pygmaeus. It is believed that their origins can be traced back to Pleistocene period, about 2 million years ago. The area of their habitat used to include most parts of Southeast Asia. However, in our time, orangutans can only be found in secluded areas of Sumatra...
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  • 20 Th Century Tropical Forests
    1,791 words
    ... been noticed that male orangutans tend to be less aggressive towards each other, when their social interaction occurs on permanent basis. Usually, this happens when males territories overlap. Female orangutans social role is reduced to raising offspring. Nevertheless, during the mating period, females become much more active. As a rule, males would not approach them, unless being welcomed by a specific mating gesticulation. Male orangutans express their excitement with breaking branches off ...
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  • Mass Extinction Earths Surface
    1,021 words
    1. Introduction 2. Body - meteors in popular culture - impacts - Tunguska event - major meteor impacts theory - Chixulub - future impact forecasts, Apophis 3. Conclusion Meteorite Impacts on Earth Meteorite impacts have always affected the Earths history, but only during the second half of the 20 th century astronomers and geologists have found and proved this. The existence of meteorites was not recognized by leading scientists of some 100 years ago. The hypothesis of objects of extraterrestria...
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  • Technological Progress Species Diversity
    1,197 words
    Biogeography Island Biogeography has been of great interest for geographers. The theory is closely connected with the theory of evolution developed by Darwin. Oceanic islands are isolated areas. They are limited in territory to examine the processes which are too complex to implement them in the mainland areas. Island Biogeography attempts to identify the factors which influence the diversity of species of a particular community. Islands are unique in their nature. They are isolated areas. The e...
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  • Weapons Of Mass Destruction Negative Influence
    2,564 words
    Eco feminism Eco feminism is the term that connects concepts of ecology and feminism. Ecology is the study of environmental systems and of human influence on the good functioning of natural communities. Human inappropriate and unlimited use of natural resources had resulted into the pollution of soil, water, and air, which caused the extinction of various animals and plants. However, ecology is not only limited to the factors of pollution, but also includes the research on population. People sta...
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  • Tropical Rain Forest Plants And Animals
    1,722 words
    A decade ago the rain forests seldom came up in every day conversation. Today the tropical woodland is the theme and setting for popular movies such as the Medicine Man, and Arachnophobia. In addition there is an International restaurant chain called the Rain Forest Caf, the caf has a rain forest theme, and is located in such countries as the United States, England, and Australia. The Rain Forest Cafe actually donates a percentage of their profits toward rain forest conservation. Rain forests ar...
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  • Million Years Ago 65 Million Years
    693 words
    Extinction of Dinosaurs Ryan Humphries Biology 6 th Period Two-hundred and thirty million years ago the first dinosaur-like creature roamed the earth. Within five million years it could be considered a dinosaur. They were soon at the top of the food chain. They populated every continent. Then 65 million years ago they vanished. The most powerful creatures ever to live on earth had become extinct. Dinosaurs were not the only victims of this mass extinction. There were many other species that were...
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  • Darwin Theory H G Wells
    1,746 words
    Herbert George Wells was born in Bromley, Kent, a suburb of London, to a lower-middle-class family. He attended London University and the Royal College of Science where he studied zoology. One of his professors instilled in him a belief in social as well as biological evolution which Wells later cited as the important and influential aspect of his education. This is how it all began. Maybe without this professor Wells wouldn? t be the famous author he is today. Most of Wells novels are science f...
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  • Birds Of Prey East And West
    1,174 words
    TABLE OF CONTENTS FACTS ABOUT LEMURS? ? ? ? ? ? ? ? 3 DIFFERENT SPECIES OF LEMURS? ? ? 3 - 5 HISTORY AND THE LEMUR? ? ? ? ? ? ? ? 5 THE ENDANGERED LEMUR? ? ? ? ? ? ? ? 6 SOURCES? ? ? ? ? ? ? ? ? ? ? ? ? 7 A lemur is a small, monkey like animal that lives primarily in Madagascar. Their sizes range from about as big as a mouse to as large as a cat. They have a roundish head with a pointed muzzle and large eyes. Their fur is wooly and their legs are longer than their arms. They are nocturnal animal...
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  • Love And Respect Bald Eagle
    891 words
    ? cry of the Wildlife The? cry of the wild? can still be heard across this great land. I have heard the bugle of an elk on the Great Plains the shrill of a bald eagle along the banks of the mightily Mississippi the roar of a brown eagle bear on windswept tundra and the gobble of a wild turkey among western foothills. Amazing beauty can still be found in the natural landscapes of this great land. I have seen through televisions, articles, books, and newspapers the towering forests pristine waters...
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  • Million Years Ago 65 Million Years
    403 words
    Dinosaurs: How they became extinct Something happened 65 million years ago, at the end of the Cretaceous period, something so devastating that it altered the course of life on earth. It seems like it happened so sudden, as geologic time goes, that almost all the dinosaurs living on earth disappeared. So how did these dominant creatures just die off? Was it a slow extinction, or did it happen all of the sudden? These questions bring rise to many different beliefs on how the dinosaur disappeared o...
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  • Endangered Species Living Things
    729 words
    Endangered species are living things whose population is so reduced that they are threatened with extinction. Thousands of species are included in this category. The International Union for the Conservation of nature and Natural Resources publishes a list of threatened mammals, birds, reptiles, amphibians, and (many people don? t consider them) plants CAUSES OF EXTINCTION Millions of years before humans, extinction of living things was linked to geological and climate, the effects of which were ...
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  • York W W Norton Neutral Stimulus
    1,968 words
    How has preparedness theory attempted to integrate a Pavlovian model of the acquisition of specific phobias with this biological specificity? What is the status of Preparedness theory today? When confronted with a phobic object or situation an individual appears to have little control and no alternative but to avoid the feared object or situation (Ohman &# 038; Soares, 1993). Consequently, individuals with a phobia can be vulnerable to anxiety induced automatic reactions to an object or situatio...
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