.The first scenario that is given is that climate lead to the extinction of the megafaunas. The article claims that throughout the period in which megafaunas were in risk of extinction a climate change took place. Therefore making it more dier which resulted in a lack of greenery for megafaunas to survive off of. The second scenario given was that due to human hunting megafauna became extinct. Despite the low population of people hunting it is claimed that it still hugely impacted the megafaunas population as they had low reproduction rates. Lastly Hanneke Meijer states that the third possible explanation for the megafaunas could be the combination of human hunting them and the lack of food for them due to climate changes.
2. Radioactive
The article discussed the changes in many habitats due to anthropogenic activity. Anthropogenic is an adjective that describes changes in nature due to the people. Next, this article discussed climate change and the impact that it is having on species like clams, and fish due to ocean temperatures rising. The article also addressed carbon dating of fossils to look for cause of extinctions. Human development and agriculture have had a tremendous impact on the population of many species that are terrestrial. Deforestation is a big problem that has caused a decline in the bird species. Commercial fishing in many areas has led to a decline in fish populations. Furthermore this article
S. 969). In order to prove the viability of an overkill theory, Martin constructed a model that would consider both the expanding population of an invading people and the population of megafauna that they are hunting throughout their colonization. He determined that even a very large biomass (in this case the megafauna) of 2.3 X 10^ 8 metric tons could be overkilled within just 1,000 years by a biomass of no more than 10^6 metric tons of Clovis hunters (Martin P. S. 972). Additionally, Martin argued that carnivores that Clovis hunters were not hunting such as the saber-tooth tiger would have become extinct around this time because of the removal of their herbivore prey (Grayson and Meltzer 586).
The ecological conditions might have changed quickly and the species was not able to adapt to those conditions, which eventually lead the species to go extinct.
They aren't able to adapt and figure their new environment quickly enough. Documents B, E, and F each tell about a specific organism that was affected by the dramatic climate change, these organisms spend years trying to perfect their home, diet, and children. Document B states, “Organisms are dying out, especially in certain areas where they aren't able to adapt as quickly, but they don't have the chance to do all that work over, so they have to live with that and start over until they reach safety again.
Between the scientists and the environmentalists, the theories continue. Let’s face it; no one or no thing will live forever. Big animals eat little animals; little animals eat bugs and plants. The Indians were noted to be a “super-predator” disrupting the normal ecosystem and ultimately causing the extinction of the megafauna. There is no concrete evidence to support this theory yet
Dinosaurs ruled the earth for over 65 million years and thankfully for the human race, they became extinct. Ultimately, only a major catastrophe could completely wipe out an entire species, let alone an entity of dinosaurs and the debacle on the causes of dinosaur extinction have flooded the minds of paleontologists for centuries. Geologist and zoologist Stephen Jay Gould published “Sex, Drugs, Disasters, and the Extinction of Dinosaurs,” to compare scientific and speculative causes of dinosaur decimation. Personally, I found this passage very informational and enjoyed reading it. Gould provides three theories that capture the reader’s curiosity, allowing room for pondering in one’s mind.
In the next few paragraphs, one will see the evidence provided by a variety of archeologists and paleoclimatologists onto how climate change caused the breakdown of the beautiful society.
Alarm after years of no trouble. They then look at where there is trouble, they then come across helf-helf destroying tacos charlies, which happens to be Mega Valadez favorite restaurant.
As a result, the declining of reproduction in species is more common now because of the
II. Main Point: The reason for animal extinction is because our animals can’t adapt to rising climate changes.
Over 98% of all organisms that have lived on Earth are now extinct. A mass extinction event occurs when a large number of species die out within a small time frame (relative to the age of Earth). Mass extinctions are intensively studied for both cause and effect, as there is usually room for debate regarding catalysts that precede the extinction and the massive influx of new biological species that follows. There have been five major mass extinctions, dubbed the “Big Five,” that have wiped out at least 50% of the species living at those times. The most well known mass extinction of the Big Five, with the decimation of every species of non-avian dinosaur, is the Cretaceous-Paleogene
Climate change is only one part of the problem with the destruction of the pinnipeds habitats, things like pollution and natural causes like natural disasters are also to blame for the destruction of their habitats. Whether in polar, temperate or even tropical conditions they still face the inevitable with the possible outcome that might cause extinction. Even though climate change and natural disasters are to be blamed for the destruction of the pinnipeds habitats, it is still only one key factors in all the destruction. Human interaction is something that also affects the habitats and the population of the pinnipeds. Humans have hunted these animals and have succeeded on obtaining oils, meat, and even their furs. These alterations and the
"We call them dumb animals, and so they are, for they cannot tell us how they feel, but they do not suffer less because they have no words” (Anna Sewell). There is undeniable evidence that animals are being affected by climate change. Even though the effects are difficult to measure, there are many different ways animals are being affected. With the loss of predator and prey species it affects the life cycles in the food chain. The earth’s climate change causes habitats such as snow, ice, or forest areas to alter, resulting in loss of habitat and food accessibility as well as causing extinction.
Not to mention “...both groups emphasized that climate change would play an increasing role in species decline…” (Gilman). Climate change is still a controversial topic to some, but many scientists have proven that it’s true. In fact, Neil Degrasse Tyson has given evidence to prove its truth and already informed the world that it’s too late to fix people’s mistakes (Neil). The extinction of species has been caused in certain instances by climate change, which is only getting worse. People have continuously altered the environment to the point of harming other species. The human race’s tendency to destroy an environment greatly impacts the plants and animals residing there. To be more specific, “Human destruction of animal and plant habitat...appear to be having a major impact on extinction rates” (Wilson). Environmental degradation and habitat destruction are both key players in the extinction of many world species. The impact people have had on the environment is much bigger than most anticipate, as they both destroy and intervene with the environment.
Rapid climate change also ends up on the suspect list of possible dinosaur extinction events. During the latter part of the Cretaceous Period continents broke up causing volcanoes to erupt and fill the sky with gas and ash resulting in a drastic climate change (“Dinosaurs Climate Change and Biodiversity”). The shifting of continents changed the Earth’s landscape, altering weather patterns and overall climate (“Dinosaur Extinction Theories”). Also, over a long period of time, climate gradually changed. Ocean habits changed, temperatures grew much more extreme causing scorching summers and frigid winters (Norell, Dingus, and Gaffney). Radical temperature changes like these led to a green-house effect, making life for the dinosaurs a lot