my mom
Two major eras that ended with mass extinctions are the Permian-Triassic extinction event, which marked the end of the Permian period, and the Cretaceous-Paleogene extinction event, which marked the end of the Cretaceous period. These events had profound impacts on life on Earth, leading to the loss of a significant number of species.
Two-thirds of all terrestrial life disappeared in the last mass extinction approximately 252 million years ago during the Permian-Triassic extinction event, also known as the "Great Dying." This event had drastic impacts on life on Earth, resulting in the loss of a vast number of species, including significant plant and animal groups.
The two devices that assist in the prevention of extinction are: game reserves and lodges (frequently with hunting) and zoos.
Two examples of species that have been brought back from the brink of extinction are the American bison, which was once hunted to near extinction but has since recovered through conservation efforts, and the California condor, which was down to only 27 individuals but now has a population over 400 thanks to captive breeding programs.
Periods on the geologic time scale represent units of time that divide eras into smaller segments. They typically last tens of millions of years and are defined by distinctive rock layers and characteristics of the Earth's environment. Each period is marked by significant shifts in global climate, the evolution of life forms, and geological events.
Two major eras that ended with mass extinctions are the Permian-Triassic extinction event, which marked the end of the Permian period, and the Cretaceous-Paleogene extinction event, which marked the end of the Cretaceous period. These events had profound impacts on life on Earth, leading to the loss of a significant number of species.
The explosion of life in the Cambrian and the mass extinction of the Permian.
For all mass extinctions (except the Cretaceous/Paleogene extinction) two probable causes are volcanic eruptions and ocean anoxia.
asteroid attack
Most extinctions occur as background extinctions because they are longer time periods unlike the shorter mass extinctions which there were only two in the Paleozoic era, the Ordovician mass extinction, and the Permian/Triassic extinction in which 95% of all marine animals became extinct
there are two eras BC -before christ and AD- anno domino (after his death)
Two-thirds of all terrestrial life disappeared in the last mass extinction approximately 252 million years ago during the Permian-Triassic extinction event, also known as the "Great Dying." This event had drastic impacts on life on Earth, resulting in the loss of a vast number of species, including significant plant and animal groups.
The background rate of extinction is much smaller than those that occur during a mass extinction. For example, carnotaurus sastrei went extinct during the mid-Cretaceous, when only a handful of dinosaurs went extinct. On the other hand, 65 million years ago, all dinosaurs went extinct during the K/T mass extinction event.
The extinction coefficient can refer to a few different measures how strongly a distinct medium absorbs light at a particular wavelength. The two most commonly referred to are molar absorptivity (which measures absorption per molar concentration) and the mass attenuation coefficient (which measures absorption per mass density).
Romantic and Victorian
you spelt ear wrong
Romantic and Victorian