Words: - Pages: 8. Moreover, with the power of science, it is possible not only to reintroduce essay on extinction of species animals to their natural environments, but to bring back those of them that are believed to have completely disappeared. a Words 2 Pages. This in turn has contributed greatly to the current level of biodiversity on the planet. The Vulnerability of Islands to Animal Extinction.
Mass Extinctions
Of all the species that have lived on the Earth since life first appeared here three billion years ago, only about one in a thousand are still living today. All the others have became extinct usually within ten million years after they first appeared. This in turn has contributed greatly to the current level of biodiversity on the planet. Extinction is the loss of populations of interbreeding organisms. It can be caused by habitat destruction, predation and the inability to adapt to changing environments. It can also be caused by changes in the climate and environment or by the evolution of new, better-adapted types of organisms that have displaced earlier forms. Commercial exploitation, damage caused by non-native plants and animals introduced in to an area and pollution also contribute to the extinction of species According to many biologists the human population is the primary reason for the increase in the rate of extinction.
Since about species have became extinct. The rapid disappearance of species was ranked as one of the planet's gravest environmental worries, essay on extinction of species, surpassing pollution, global warming and the thinning of the ozone layer, according to the survey of scientists commissioned by New York's American Museum of Natural History. Since the s, worldwide commercial exploitation of animals for food and other products has caused many species to become extinct or endangered. The whaling industry, in which whales are slaughtered for oil and meat, has led many whale species to the brink of extinction. The African black rhinoceros, killed for its horn, essay on extinction of species, which is prized as a medicine and aphrodisiac, is also critically endangered.
The great auk and the passenger pigeon became extinct in the 19th and early 20th centuries because of over hunting, and the Carolina parakeet also died as a species because of the combination of over hunting and habitat destruction. It is endangering medicinal plants and rapidly leading them into extinction. To begin with, the over-harvesting of medicinal plants is rapidly leading them to extinction, is a plant species known as Himalayan yew tree utilize to treat cancer, is on the verge of becoming extinct in result to deforestation in attempt to collect fuel. Deforestation caused by human destruction has endangered the species and half of all Magnolia flowers are endangered and leading to extinction.
Scientist plan to invest in "planting the species as commercial crop", however, the rate of extinct In the argument, "Why worry about extinction," David M, essay on extinction of species. Armstrong says that humans are accelerating the extinction rate, while Norman D. Levine argues that extinction is just the course of nature. Armstrong says, "Extinction is a failure to adapt to change," and, "Extinction is a natural essay on extinction of species. Different Views on the Cause of the End-Permian Mass Extinction The End-Permian mass extinction was huge, the largest of the five major mass extinctions on the geological time scale, essay on extinction of species. There are five major theories to explain the extinction: 1. Erwin also states that this makes the end-Permian mass extinction the longest extinction during the Phanerozoic era.
The First Extinction and the Terminal Extinction. Therefore the amount of time the extinction took is in disagreement among authors with theories as to the cause of the End-Permian mass extinction. The Theory of Nemesis and Reoccurring Mass Extinctions For several decades, the topic of periodical mass extinctions has been one of much debate and speculation by the scientific community as well as the media and public. This would then disrupt the remainder of the food chain and result in mass extinctions. Scientists connected these periodical mass extinctions with Nemesis because of their similar periods. One of the main pieces of support for the Nemesis Theory is proof of periodic extinctions. This could also be the cause for the variations in time between each period A fourth school of thought holds that many factors converged to cause mass extinction during the last ice age "Combination".
The proponents of the "Kill" theory contend that over-hunting directly caused the mass extinction of the large Pleistocene mammals in North America or essay on extinction of species perhaps over-hunting eliminated a "keystone species" and this ultimately led to extinction. Extinction is a natural process in the evolution of life essay on extinction of species earth. No single essay on extinction of species factor can be conclusively identified as the lo A number of reasons are behind the possible extinction of the wild African lion. The possible extinction of lions is a menace to tourism in Africa. Their extinction would reduce the economic gains the entertainment industry obtains from broadcasting and selling films about the African lion.
From an ecological perspective, the extinction of the African lion endangers the balance of the ecosystem. I have discussed the possibility of the extinction of the African wild lion. In order to illustrate his point, Gould uses scientific reasoning to compare three theories that attempt to explain the extinction of the dinosaur. Siegel, who presumed that massive overdosing due to poisonous flowering plants drugs may have caused the extinction of the dinosaur and finally, the theory of Luis and Walter Alvarez which is focused on the possibility of a huge asteroid striking earth and causing the dinosaurs, as well as other species, to become extinct.
Also, as Gould points out, this theory does not take into account the extinction of several species of marine l What causes shark extinction? There are two reasons I came up with that can cause sharks' extinction such as human beings by doing bycatch or overfishing and then there's illegal shark finning. Human beings are the main predators for sharks and the main cause for sharks' extinction. Type a new keyword s and press Enter to search. extinction Word Count: Approx Pages: 12 Save Essay View my Saved Essays Downloads: 45 Grade level: High School Login or Join Now to rate the paper. Essays Related to extinction 1, essay on extinction of species. Over-Harvesting and the Extinction of Medicinal Plants. Word Count: Approx Pages: 3 Has Bibliography Grade Level: Undergraduate.
Extinction Is The Question. Word Count: Approx Pages: 3 Grade Level: High School. Different Views on the End-Permian Mass Extinction. Word Count: Approx Pages: 4 Grade Level: High School. The Theory of Nemesis and Reoccurring Mass Extinctions. Word Count: Approx Pages: 6 Has Bibliography. Mass Extinction At The End Of The Last Ice Age, essay on extinction of species. Lions - On the Bridge of Extinction. Word Count: Approx Pages: 6 Has Bibliography Grade Level: Undergraduate. Word Count: Approx Pages: 2 Grade Level: Undergraduate. Coral Reefs and Shark Extinction. Word Count: Approx Pages: 4 Has Bibliography Grade Level: High School.
topics for compare and contrast essay
Northern elephant seals are nowadays numbered around , along the West Coast, although there were fewer than a hundred of them left alive just recently. All this became possible due to the significant efforts of reintroduction National Geographic. Moreover, with the power of science, it is possible not only to reintroduce endangered animals to their natural environments, but to bring back those of them that are believed to have completely disappeared. New discoveries in genetics, in particular the advancements connected to CRISPR-Cas9, give humanity hope of bringing back animals considered to have disappeared forever.
Ecologists at the University of California, Santa Barbara, believe the two species that would be especially reasonable to resurrect are the woolly mammoth, the last of which died about years ago, and the passenger pigeon, a gray bird with a red breast, once common all over North America and, which had gone extinct in early s. Both of these species were functionally unique species strongly affecting their environments, so their vanishing had changed the ecosystems they lived in as well. In their turn, the passenger pigeons were extremely important for the forests they lived in as well ScienceMag.
Reviving these two species will likely solve a number of ecological problems in an effective and quick way. As it can be see, mass extinction is not something that had never happened before on Earth. There are ways, however, to slow down or even turn back the processes of extinction; one of them, the more traditional one, is the reintroduction of cage-bred species to their natural environments. The other more advanced one involves the most recent advancements in genetics, and will probably allow scientists to resurrect animals believed to have gone extinct forever. Thus, there is still hope for planet Earth.
Remember Me. What is your profession? Student Teacher Writer Other. Username or Email. Academic Assignments Writing an Essay. If the bird were to go extinct, that would incredibly harm us since we would be in constant contact with this harmful animal or insect. This being said, animals going extinct greatly affect humans since humans because they may not know how to handle a situation that a certain species, birds, have been handling their whole existence. Clearly, natural breeding is the preferred method for thriving populations; but by definition these are not of conservation concern.
Humans need to make sure that they will be set for survival, meaning, keeping animals around that they depend on for that…. They eat whatever they find and that waste can kill them. By making a few changes in our daily routines, we can save the planet in which we live and also on our monthly expenses. Some of those changes can include taking shorter showers, turning off the water when it is not being used, and carpooling with someone. Some scientists believe otherwise though. However, as stated before, the possible consequences would outweigh the benefits. Cloning would do damage to the environment and other species, and it could actually lead to more endangered animals.
There are many animal populations around the world that are dying off quickly and we should focus on them first. Additionally, if the de-extinction tool is used, many endangered species could become extinct. Thus, species that are brought back would be a distraction to the species that are currently living in areas and to endangered…. Littering damages our environment, goes into the homes of our species and causes health issues, some leading to death. I will follow this step because of the amount of love i have for our wildlife in my heart. I want to save everything in the environment and it is not a hard action for other individuals to do.
It just takes a simple choice of where to put garbage, and if everybody made the correct choice we could see an improvement in our…. Soon we will have to grow our own mammals in a lab or face bigger problems. Taking actions to save these mammals will be a challenge because of how much they are involved into our world as food and entertainments but that does not mean it is the end to save these endangered mammals. This environment is as much our home as in theirs. They do no harms to ours so why are we doing it to theirs? However, if all the members of a species die, then the species becomes extinct. Extinction is local if a species disappears from a part of its range, but still exists elsewhere.
A global extinction is the total disappearance of all the members of a species so that none are left alive on the earth. Paleontologists have discovered millions of species of plants and animals that experienced extinction in the approximately million years that life has existed on earth. The fossil remains of living creatures show clearly that life was teeming on the earth during the Cambrian Era. Many scientists believe that life probably emerged in the chapter of the biography of the earth called the Precambrian Era. However, these were probably soft bodied-fauna and flora. In the absence of shells, skeletons, or hard body parts, they have been lost to the fossil record. What is certain is that in the Cambrian Era, life forms exploded in number.
New species seemed to have developed very rapidly. Despite the presence of life and of numerous species, it is now known from the fossil record that massive deaths of whole species also occurred. Paleontologist, biologists, and other life scientists have estimated that extinction is a fact of biological life. It is estimated that at least The law of life is extinction. There have been an estimated five mass extinctions in the history of life on earth. Fossil evidence strongly suggests that massive dying of species occurred in the Ordovician, Devonian, and Permian geological eras.
The most obvious example is the disappearance of the dinosaurs. These mass extinctions have been uncovered by paleontologists as they have examined the fossil record. The pattern has been the development of a few species, then an explosion in the numbers of new species, followed by a period of little change, followed by a deep dip in the number of species. The extinction-causing event is followed by a new period of at first slow development and then an explosion in numerous new species and then another massive loss. Mass extinctions have been best seen in the fossil record of marine animals. The sedimentary record is clearer because better fossil specimens have been deposited in marine sediment than in other kinds of sediment, and show that the Paleozoic Era of the Cambrian Period was a time of rapid expansion, which was followed by massive extinctions in the Ordovician Era.
Approximately 50 percent of the animal families disappeared. This massive die-off included many trilobites. Species continued to diversify between and million years ago when the Ordovician extinction was followed by a Devonian extinction. At that time, about 30 percent of the species disappeared in animal families. Again many trilobites disappeared, along with many agnathan and placoderm species of fish. In the Permian Era, about half of all animal families vanished. These included many of the new species that had not been found in the fossil record prior to the Devonian extinction.
Swept away were 95 percent of marine species, great numbers of trees, amphibians, most bryozoans and brachiopods and all trilobites. The Triassic extinction occurred about million years ago. It destroyed many reptiles, animal families and many marine mollusks. It is estimated that 35 percent of the animal families disappeared. The fifth of the natural mass extinctions was the Cretaceous extinction. It was the most destructive and to date most widely known by the public. In the Cretaceous Era, which lasted for million years, the dinosaurs were the rulers of the earth. Then, not slowly or gradually-but suddenly-all of the dinosaurs and most reptiles vanished into the Cretaceous Night.
Gone were Tyrannosaurs Rex and all of his prey. Along with the dinosaurs, numerous other species aslo disappeared. The disappearance of the dinosaurs from the fossil record was disturbing to many geologists, biologists, paleontologists, and others because it violated the idea of evolutionary uniformitarianism.
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