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Two-thirds of all terrestrial life disappeared in the last mass extinction approximately?
Approximately 245 million years ago
What are two examples of species that are success stories brought back from the brink of extinction?
The bald eagle and the tiger are two animals saved from almost extinction
What is some devices to prevent species extinction?
The two devices that assist in the prevention of extinction are: game reserves and lodges (frequently with hunting) and zoos.
What do periods on the geologic time scale represent?
An era, in geologic terms, is a geological time period encompassing two or more geologic periods.
Two features that distinguish matter are?
1) Matter has mass. 2) It occupies space.
The Paleozoic Era is noted for what two changes?
The explosion of life in the Cambrian and the mass extinction of the Permian.
What is a probable cause of two mass extictions?
For all mass extinctions (except the Cretaceous/Paleogene extinction) two probable causes are volcanic eruptions and ocean anoxia.
The last mass extinction of dinosaurs on Earth occurred between which two geologic periods?
asteroid attack
Why do you think most extinction's occur as background extinctions?
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
Two-thirds of all terrestrial life disappeared in the last mass extinction approximately?
Approximately 245 million years ago
How many eras are ther?
there are two eras BC -before christ and AD- anno domino (after his death)
What are the last two geologic eras?
Fat People
How does the background rate of extinction differ from mass extinctions?
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.
Could you please define the extinction coefficient?
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).
What is ears two most recent eras?
you spelt ear wrong
What two eras immediately preceded modernist era?
Romantic and Victorian
What two eras immediately preceded the Modernist era?
Romantic and Victorian
