Essay topics: TPO-10 - Integrated Writing Task
The sea otter is a small mammal that lives in waters along the western coast of North America from California to Alaska. When some sea otter populations off the Alaskan coast started rapidly declining a few years ago, it caused much concern because sea otters play an important ecological role in the coastal ecosystem. Experts started investigating the cause of the decline and quickly realized that there were two possible explanations: environmental pollution or attacks by predators. Initially, the pollution hypothesis seemed the more likely of the two.
The first reason why pollution seemed the more likely cause was that there were known sources of it along the Alaskan coast, such as oil rigs and other sources of industrial chemical pollution. Water samples from the area revealed increased levels of chemicals that could decrease the otters' resistance to life-threatening infections and thus could indirectly cause their deaths.
Second, other sea mammals such as seals and sea lions along the Alaskan coast were also declining, indicating that whatever had endangered the otters was affecting other sea mammals as well. This fact again pointed to environmental pollution, since it usually affects the entire ecosystem rather than a single species. Only widely occurring predators, such as the orca (a large predatory whale), could have the same effect, but orcas prefer to hunt muchlarger prey, such as other whales.
Third, scientists believed that the pollution hypothesis could also explain the uneven pattern of otter decline: at some Alaskan locations the otter populations declined greatly, while at others they remained stable. Some experts explained these observations by suggesting that ocean currents or other environmental factors may have created uneven concentrations of pollutants along the coast.
Summarize the points made in the lecture, being sure to explain how they cast doubt on specific points made reading passage.
|Post date||Users||Rates||More about the essay|
|1 week 1 day ago||toeflibt.ara||80||Read full essay|
|1 month 2 weeks ago||ebiv87||73||Read full essay|
|1 month 2 weeks ago||ebiv87||73||Read full essay|
|2 months 2 weeks ago||-vv-||81||Read full essay|
|2 months 2 weeks ago||Sar||71||Read full essay|
|2 months 2 weeks ago||Sar||68||Read full essay|
|3 months 1 week ago||paras001||66||Read full essay|
|4 months 2 weeks ago||donya goodarz||40||Read full essay|
|5 months 2 days ago||nasimn||60||Read full essay|
|5 months 2 days ago||nasimn||65||Read full essay|
- TPO-49 - Integrated Writing Task Like many creatures, humpback whales migrate long distances for feeding and mating purposes. How animals manage to migrate long distances is often puzzling. In the case of humpback whales, we may have found the answer: the (100)
- TPO-48 - Integrated Writing Task In recent years, many frog species around the world have declined in numbers or even gone extinct due to changes in their environment. These population declines and extinctions have serious consequences for the ecosystems (100)
- TPO-47 - Integrated Writing Task Pterosaurs were an ancient group of winged reptiles that lived alongside the dinosaurs. Many pterosaurs were very large, some as large as a giraffe and with a wingspan of over 12 meters. Paleontologists have long wondered (100)
- TPO-46 - Integrated Writing Task In the United States, medical information about patients traditionally has been recorded and stored on paper forms. However, there are efforts to persuade doctors to adopt electronic medical record systems in which informa (100)
- TPO-45 - Integrated Writing Task Any student of paleontology will be struck by the fact that a great many animals of the past were considerably larger than they are today. This holds true for species ranging from dinosaurs to most mammals. Just why they w (100)
- TPO-44 - Integrated Writing Task In 1957 a European silver coin dating to the eleventh century was discovered at a Native American archaeological site in the state of Maine in the United States. Many people believed the coin had been originally brought to (100)
- TPO-43 - Integrated Writing Task Agnostids were a group of marine animals that became extinct about 450 million years ago. Agnostid fossils can be found in rocks in many areas around the world. From the fossil remains, we know that agnostids were primitiv (100)
- TPO-42 - Integrated Writing Task Glass is a favored building material for modern architecture, yet it is also very dangerous for wild birds. Because they often cannot distinguish between glass and open air, millions of birds are harmed every year when the (100)
- TPO-41 - Integrated Writing Task Burning coal in power plants produces a waste product called coal ash, a material that contains small amounts of potentially harmful chemicals Environmentalists in the United States are concerned about the damage such harm (95)
- TPO-40 - Integrated Writing Task Many scientists believe it would be possible to maintain a permanent human presence on Mars or the Moon. On the other hand, conditions on Venus are so extreme and inhospitable that maintaining a human presence there would (100)