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Extinctions are a normal part of the evolutionary process, and the background extinction rate is a measurement of "how often" they naturally occur.Normal extinction rates are often used as a comparison to present day extinction rates, to illustrate the higher frequency of extinction today than in all periods of non-extinction events before it.
Recently, it has been reported that the extinction rate of frogs is increasing. Based on observed extinction rates far beyond expected background extinction rates, we can predict that an event of a catastrophic nature is headed our way. [16] A decade ago, Panamanian golden frogs were plentiful in numbers and easy to find around Panama. However ...
The philosophy of evolution is the branch of philosophy that examines the philosophical implications of evolution and the intersections of evolutionary biology with ...
Permian–Triassic extinction event 252 Ma Large igneous province (LIP) eruptions [ 23 ] from the Siberian Traps , [ 24 ] an impact event (the Wilkes Land Crater ), [ 25 ] an Anoxic event , [ 26 ] an Ice age , [ 27 ] or other possible causes
Evolutionary thought, the recognition that species change over time and the perceived understanding of how such processes work, has roots in antiquity. With the beginnings of modern biological taxonomy in the late 17th century, two opposed ideas influenced Western biological thinking: essentialism, the belief that every species has essential characteristics that are unalterable, a concept ...
The prospect of extinction is itself a break from previous religious and mythological eschatology in the measure that it is thought as an absolute and naturalistic event. [9] As such, human extinction is a recent invention in the intellectual history of calamity. [5] Its major historical source is present in science fiction literature.
Now, however, background performers could truly disappear. Already threatened by the advancement in special effects that create computer-generate crowds, the background acting community is bracing ...
An extinction event (also known as a mass extinction or biotic crisis) is a widespread and rapid decrease in the biodiversity on Earth.Such an event is identified by a sharp fall in the diversity and abundance of multicellular organisms.