The Major Cause Of The Extinction Of Sea Cows Summary

I believe that underwater noise has an effect on marine animals such as whales. Using information from the passages I will prove my point. Their numbers are declining rapidly and I believe that underwater noise has some involvement in the rapid decrease in their population numbers. The information given within the two passages will help prove my point.

The evolutionary path of a whale is a fascinating process of a terrestrial mammal that evolves into a marine mammal. This evolutionary path started with one of the earliest ancestors called “Pakicetus”. A Pakicetus was discovered to be a land animal with four legs that had teeth as carnivores. It skull structure was long, but this organism didn’t look like any marine animal. The scientist then discovered that on the skull’s ear region it was surrounded by a bony wall. This feature on an organism only was distinct from one type of species, scientist discovered that this animal “Pakicetus” was an ancestor of a whale. By comparing the early whales Pakicetus to the next generation of ancestors Ambulocetus, the Ambulocetus whale looks more like

While the author of the article believes that Brachiosaurus were aquatic animals, the professor disagrees with this statement. The professor points out that in spite of the fact that some species of dinosaur would spend a great deal of time in water, there was no possible that Brachiosaurus were aquatic ones. To strengthen her point, the professor provides sufficient evidence respectively to the points made in the article.

The question of what caused the extinction of megafauna during the Late Pleistocene period is one that archaeologists have struggled to answer for decades, but why should it matter? Discovering with certainty the cause of megafaunal extinction would

b. Trial and error in agriculture (Returns to scale). Best practices were learned and passed down. Returns to agriculture increased.

The debate surrounding Makah whaling is a heated one to say the least. There are valid points on both sides of the argument, but there is one side I find to be more valid once the facts have been looked at. I will examine and present my findings regarding past and current laws and regulations related to whaling, types of whaling, other countries that take an active part in whaling (and why), as well as the Makah culture – both past and present. In this paper I will argue why the Makah should not be allowed to resume whaling, as it is unnecessary and could potentially put the grey whale species back on the endangered list.

The reading passage proposes three theories which support the idea that a dinosaur which is called edmontosaurus survived in the winter by migrating to the south, the more hospitable region than the extremely cold in the North Slope. However, the professor in the listening respectively contradicts each theory in the reading passage by using strong evidence as support.

By looking at the graph from 4.1 there is a pattern of existence between the population of moose and wolves where both the moose and wolves population fluctuates constantly. When the moose was abundant their food source was low. When the wolves came they lowered the moose population in turn raising

Next, Diamond evaluated an opposing theory, which challenged the overkill hypothesis because there was no killing site or direct prove that the killing is done by human. Some critics raised a climate-change hypothesis instead to account for the extinction.

The concept of species going extinct was not always accepted as fact. It wasn’t until the discovery of the American mastodon that the concept of extinction was even considered. With the discovery of the bones, When the bones were discovered, many theories were constructed, such as that the bones were actually from multiple creatures, or that this was simply an undiscovered species and hadn’t been found. The discovery of other mysterious, lost species led to the concept of extinction, and the idea that the mammoth was indeed a species that, while it once was prevalent, no longer roamed the Earth. In chapter three, Kolbert writes about her visit to Iceland in which she learned about the loss of the great auk, a three foot tall bird reminiscent of a large penguin or puffin. She then proceeds to write the tragedy of the great auks, that being that they were regularly hunted and killed. The final moments of the great auk’s species can be tracked down, as they were captured and sold and their only egg was broken. The concept of human-caused extinctions wasn’t new, as Darwin wrote about how the Galápagos tortoises were dying out very rapidly due to overhunting. The extinction of species stems from events that drastically affect them, be them environmental changes to human

Firstly, the professor mentions that sea cows have not been overhunted by people. In other words, sea cows were pretty massive and enomous. But native Sebirian people were not very much. So people could not hunt sea cows and they didn't hunt. So it's unlikely that native peole have been overhunt sea cows. The point is the opposit of the belief in the reading that people caused sea cows deline since they have been overhunt. Therefor, the professor refutes

The image presentation of how the explorers thought of these animals significantly changed over time. For example, Thevet describes the Hoga as an aquatic mammal that resembled a pig living in the water. His drawing depicts his imagination of this animal when he states that it can kill and eat other fishes. A modern biologist can conclude that such an animal doesn’t exist in their fields of study.

It contains an expanse of tundra with many marshes and lagoons with rivers situated between foothills of the Brooks Range and the wide, icy waters of the Beaufort Sea. Environmentalists said that this area “is the most biologically productive part of the Arctic Refuge for wildlife and is the center if wildlife activity.” The importance of these resources is not measurable. The Arctic is home to such animals as caribou, polar bears, grizzly bears, musk oxen, whales, wolves and snow geese. This area is full of wildflowers and contains water of excellent, unpolluted quality and quantity. The Arctic Ocean costal plain is an area critical to the survival of many birds and mammals (‘Alaska Wild’).

Commercial whaling is a serious world issue that has always been difficult for those who are in support and those who are against it. Each group defends their side with convincing arguments. Morally, whaling is wrong, but do the reasons for whaling outweigh the reasons to cease the primitive hunts? By studying the effects of whaling,realizing how culture has changed over time, and taking note of the money that would be saved, it can clearly be seen that there is no longer a current need for whaling to continue. Efforts have been made to try to stop whaling, but with no help from any authoritative figure,nothing has been done to regulate the whaling. The famous sea shepherd, known for its strikes against whaling, can even be seen on

However, such mass extinction opens up speciation – when new species are developed. After the K-Pg extinction, new groups of organisms were on the rise. Giant boid snakes (12 – 15 meters) began appearing on land and the teleost fish (diverse class of ray-finned fish) filled marine niches left vacant. Most significantly, “Paleocene mammals would spread and evolve into the many ecological niches left open by the extinction of the dinosaurs,” (“Cretaceous: Extinction of the Dinosaurs”).