Daniel T*** Candidate Number- 71** Centre Number- 443** What Killed The Dinosaurs? Contents Page Front Cover ………………………………………………………………… 1 Table of Contents ………………………………………………………… 2 Introduction ……………………………………………………………….. 3 Scientific Background ………………………………………………….. 4 Argument for What Killed the Dinosaurs ……………………….. 8 Arguments Against this theory ……………………………………… 10 Introduction So then, the big question is what killed the dinosaurs? For around 200 million years dinosaurs had ruled the world, they had grown huge in every environment. Then around 65 million years ago, they suddenly disappeared from the fossil record. What lead to their extinction will be discussed in this case study.
Some species have done very well, since the law was enacted, including them the peregrine falcon, the American alligator, the bald eagle, and the California condor. Some do not feel that it is working and that the vast majority of the species have not improved under the current law. (Nordell 2005 ) Should Endangered Species Act Be Strengthened? Extinction is normal, 99.9 per cent of the species that have inhabited the planet are extinct (Easton 2009). The process of extension is suppose to happen over time today, however, human intervention is destroying the habits of spices, hunting them into extinction and obliterating their food supplies.
The term meteor is actually used to describe the streak of visible light after it ‘s trip through the Earth ‘s orbit . One of the most famous craters , which is like a giant scar caused by a NEO hitting the Earth , is in Arizona .Meteor Crater , or Barringer Meteorite Crater as it is also known as , is a jarring reminder of what kind of damage a NEO can do upon impact . Most meteors are small enough that once they are pulled in by the Earth ‘s orbit and hit the atmosphere , they burn up and disintegrate before they ever get the chance to actually hit the Earth ‘s surface . Another group of NEO ‘s are asteroids . One of the largest asteroids that astronomers keep their eyes on is Apophis .
Forests have undergone major destruction. The ocean is becoming stagnant. Almost everywhere, the soil itself is largely damaged. In addition, 50,000 species a year are becoming extinct; no ecosystem can be identified as improving. Humans suffer from increasing numbers of diseases caused by pollution.
Mass Extinction Part A: Mass extinction can typically be thought of as the extinction of an entire species/ rapid disappearance of a species due to environmental or human causes. Traditionally mass extinctions have been seen ass some type of catastrophe for the worlds biota. Definition however must include: • Event must be rapid • Over 50% of all life on earth became extinct • Life forms that become extinct must belonged to a different phyla, on land and in the sea. There have to date been five mass extinctions, the oldest occurred during the lower Cambrian Period some 542-488 [pic]million years ago. The Cambrian Period is the first period of the paleozia period.
Their main competitors were the pseudosuchia, such as aetosaurs, ornithosuchids and rauisuchians, which were more successful than the dinosaurs. Most of these other animals became extinct in the Triassic, in one of two events. First, at about 215 million years ago, variety of basal archosauromorphs, including the protorosaurs, became extinct. This was followed by the Triassic–Jurassic extinction event, that saw the end of most of the other groups of early archosaurs, like aetosaurs, ornithosuchids, phytosaurs, and
But these are only small pieces of the extinction puzzle the planet is miffed with. However, the overall numbers are terrifying. Of the 40,000 species that the 10,000 scientists in the World Conservation Union have figured out, one in every four mammals, one in eight birds, one in three amphibians, other wildlife breeds including perhaps 51 per cent of reptiles, 52 per cent of insects are at an increasing risk of extinction. Soon there will many more added to this list of endangered species all around the world. There is not just a single cause for such huge loss.
About 50 thousand species of animals and plants disappear in result of deforestation every year. Seventy percent of plants and animals live in forests, but when their homes are destroyed, many cannot survive. The trees of a rain forest provide shelter for some species and provide the canopy that regulates the temperature. Cutting down the forest trees causes drastic temperature changes making the forest similar to a desert, in which inhabitants cannot survive. One animal specific that has been affected by loss of habitat is the red panda, also known as the fire fox or lesser panda.
Nesting Season 5. Reasons for Haunting 6. Other Threats to these Species 7. Conservation Efforts 8. Conclusion Introduction Everyday thousands of marine animals were being cruelly killed in many parts of the world.
In Africa there are two species of rhinoceros, the black rhino and the white rhino. According to Business Day, there are about 20 000 white and 1 700 black rhino in South Africa. In recent decades, rhinos have been hunted to the point of near extinction. The world rhino population has declined by ninety percent since 1970. We only have five species remaining in the world today, and all of them are endangered.