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    _____________ occurs when a large number of species goes extinct over a relatively short period of time.

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    The extinction of many species in a relatively short period of geologic time is called what?

    Such phenomenon is called mass extinction event or biotic crisis. Mass extinction of living organisms happened many times on earth, which is evident from fossil remains of different geological time periods . Mass extinction always leads to loss of biodiversity but immediately after such large scale extinction, evolution/speciation of remaining organisms accelerated. ()

    The extinction of many species in a relatively short period of geologic time is called what?

    Biology The Elements of an Ecosystem Ecosystems Overview

    1 Answer

    Mandira P. Jan 24, 2017

    Such phenomenon is called mass extinction event or biotic crisis.

    Explanation:

    Mass extinction of living organisms happened many times on earth, which is evident from fossil remains of different geological time periods .

    Mass extinction always leads to loss of biodiversity but immediately after such large scale extinction, evolution/speciation of remaining organisms accelerated.

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    Mass extinction Definition & Meaning

    Mass extinction definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation. Look it up now!

    Top Definitions Quiz Examples Cultural

    mass extinction

    The extinction of a large number of species within a relatively short period of geological time, thought to be due to factors such as a catastrophic global event or widespread environmental change that occurs too rapidly for most species to adapt. At least five mass extinctions have been identified in the fossil record, coming at or toward the end of the Ordovician, Devonian, Permian, Triassic, and Cretaceous Periods. The Permian extinction, which took place 245 million years ago, is the largest known mass extinction in the Earth's history, resulting in the extinction of an estimated 90 percent of marine species. In the Cretaceous extinction, 65 million years ago, an estimated 75 percent of species, including the dinosaurs, became extinct, possibly as the result of an asteroid colliding with the Earth. Compare background extinction.

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    WORDS NEARBY MASS EXTINCTION

    masseter, masseteric artery, masseteric nerve, masseur, masseuse, mass extinction, Massey, mass hysteria, massicot, massif, Massif Central

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    HOW TO USE MASS EXTINCTION IN A SENTENCE

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    CULTURAL DEFINITIONS FOR MASS EXTINCTION

    mass extinction

    Any of several events in the Earth's past in which large numbers of species (in some cases, up to eighty percent) became extinct.

    NOTES FOR MASS EXTINCTION

    The most famous mass extinction included the destruction of the dinosaurs sixty-five million years ago. (See Alvarez hypothesis.)

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    WORD OF THE DAY areology

    noun | [air-ee-ol-uh-jee ]

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    Extinction

    Extinction is the dying out of a species. Extinction plays an important role in the evolution of life because it opens up opportunities for new species to emerge.

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    ENCYCLOPEDIC ENTRY

    Extinction

    Extinction is the dying out of a species. Extinction plays an important role in the evolution of life because it opens up opportunities for new species to emerge.

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    Biology, Earth Science, Ecology, Geography, Geology, Physical Geography

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    Dinogorgon Skull

    A dinogorgon skull protrudes from a rock with the South African scrubland in the background.

    PHOTOGRAPH BY JONATHAN BLAIR

    When a species disappears, biologists say that the species has become extinct. By making room for new species, extinction helps drive the evolution of life. Over long periods of time, the number of species becoming extinct can remain fairly constant, meaning that an average number of species go extinct each year, century, or millennium. However, during the history of life on Earth, there have been periods of mass extinction, when large percentages of the planet’s species became extinct in a relatively short amount of time. These extinctions have had widely different causes.

    About 541 million years ago, a great expansion occurred in the diversity of multicellular organisms. Paleobiologists, scientists who study the fossils of plants and animals to learn how life evolved, call this event the Cambrian Explosion. Since the Cambrian Explosion, there have been five mass extinctions, each of which is named for the geological period in which it occurred, or for the periods that immediately preceded and followed it.

    The first mass extinction is called the Ordovician-Silurian Extinction. It occurred about 440 million years ago, at the end of the period that paleontologists and geologists call the Ordovician, and followed by the start of the Silurian period. In this extinction event, many small organisms of the sea became extinct. The next mass extinction is called Devonian extinction, occurring 365 million years ago during the Devonian period. This extinction also saw the end of numerous sea organisms.

    The largest extinction took place around 250 million years ago. Known as the Permian-Triassic extinction, or the Great Dying, this event saw the end of more than 90 percent of the Earth’s species. Although life on Earth was nearly wiped out, the Great Dying made room for new organisms, including the first dinosaurs. About 210 million years ago, between the Triassic and Jurassic periods, came another mass extinction. By eliminating many large animals, this extinction event cleared the way for dinosaurs to flourish. Finally, about 65.5 million years ago, at the end of the Cretaceous period came the fifth mass extinction. This is the famous extinction event that brought the age of the dinosaurs to an end.

    In each of these cases, the mass extinction created niches or openings in the Earth’s ecosystems. Those niches allowed for new groups of organisms to thrive and diversify, which produced a range of new species. In the case of the Cretaceous extinction, the demise of the dinosaurs allowed mammals to thrive and grow larger.

    Scientists refer to the current time as the Anthropocene period, meaning the period of humanity. They warn that, because of human activities such as pollution, overfishing, and the cutting down of forests, the Earth might be on the verge of—or already in—a sixth mass extinction. If that is true, what new life would rise up to fill the niche that we currently occupy?

    Anthropocene Noun

    period of time during which human activities have impacted the environment enough to constitute a distinct geological change.

    biological Adjective

    having to do with the study of life and living organisms.

    biologist Noun

    scientist who studies living organisms.

    Cambrian Explosion of Life

    Noun

    rapid development of almost all major types (phyla) of organisms during the Cambrian time period.

    Cretaceous period Noun

    145 million to 65 million years ago. The period ended with extinction of the dinosaurs and the rise of mammals.

    Devonian Adjective

    geologic period between Silurian and Mississippian.

    evolution Noun

    change in heritable traits of a population over time.

    extinction Noun

    process of complete disappearance of a species from Earth.

    fossil Noun

    remnant, impression, or trace of an ancient organism.

    Jurassic Adjective

    having to do with the time period between 190 million and 140 million years ago, characterized by an abundance of dinosaurs and ammonites.

    multicellular Adjective

    composed of more than one cell.

    niche Noun

    role and space of a species within an ecosystem.

    paleobiology Noun

    study of the biology of fossilized organisms.

    Permian Adjective

    last geologic period of the Paleozoic Era.

    Triassic Adjective

    start of the Mesozoic era when dinosaurs first emerged.

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