That's when a species or group of species no longer exists. The Dodo bird, for example, has gone extinct in recent history because all of them died out.
Exinction
A Mass exinction
In 1940 law passed to protect them.
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Prairie dog populations are greatly diminished below their numbers prior to the arrival of Europeans. The size of their habitat has also been greatly diminished. There are five species of prairie dog, three of which are least concern, but the Mexican and the Utah prairie dog are both listed as endangered.
Extinction refers to the permanent loss of a species when its last individual dies, resulting in the complete disappearance of that species from the planet. This can occur due to various factors, including habitat destruction, climate change, overexploitation, and invasive species. Once a species becomes extinct, it cannot be recovered, leading to a loss of biodiversity and ecological balance.
The Paleogene was a geologic time period, the first of two periods of the Cenozoic era. It began 65.5 million years ago following the end of the Cretaceous Period, the last period of the Mesozoic Era. It ended 23 million years ago and was followed by the Neogene, the current period. During this time, Earth recovered from the mass exinction event that wiped out the dinosaurs and mammals became the dominant land animals. India collided with mainland Asia, forming the Himalayas, and ice sheets began to form in Antarctica.
If an animal is endangered, it means that threats to its survival are considerable, and that action must be taken to ensure its continued existence. The koala is not currently endangered, but there are campaigns being mounted to have the koala listed as endangered, as threats to its survival are increasing, and there is concern that, if current trends continue, the koalas will be in imminent danger of exinction. If the koala were to be listed as endangered, it would mean higher levels of protection for the animal, particularly in reagrd to its habitat. Fewer housing and residential development would impact upon koala territory.
Major events in Earth's history include the formation of the planet around 4.5 billion years ago, the development of life around 3.5 billion years ago, the formation of the first continents around 2.5 billion years ago, the rise and fall of dinosaurs during the Mesozoic era, and the evolution of humans in the last few million years. Additionally, significant climate changes, mass extinctions, and the movement of continents have shaped the history of Earth.
The Cretaceous Period was the 3rd geological period in the Mesozoic Era. The end of the period would see the extinction of all non-avian dinosaurs as well as all the large marine reptiles, pterosaurs as well many other species of animals and plants. It lasted from 145.5 to 65.5 million years ago. It was the time between 2 extinction events, the smaller End Triassic Extinction event and the larger K-T Exinction event.
releases harmful toxins into the airuses up natural resourcescan create smogWhen fossil fuels like coal, oil and natural gas are burned (usually to produce electricity or to power transport) they release extra carbon that has been stored underground for millions of years. The carbon cycle is unable to cope with all this extra carbon, which (in the form of the greenhouse gas, carbon dioxide) joins all the other gases in our atmosphere and enhances the greenhouse effect, which keeps the earth's heat from escaping into space. This enhanced, or accelerated greenhouse effect is causing global warming.
Either extinction of several species or over population. For instance if the trophic level of grasses and small plants died out, then there would be exinction of all species that rely on that source (soley or in majority) as food. If an upper trophic level such as large carnivors died out then you would see an over population of the animals that the large carnivor ate as a majority of its diet.