The Ordovician-Silurian Mass Extinction

No clear cause has been found.

76%

sessile animals (those unable to move about)

<p>Climate change, flood basalt eruptions, and an asteroid impact</p> Signup and view all the answers

<p>The Quaternary period</p> Signup and view all the answers

<p>130,000 BCE (the start of the Late Pleistocene)</p> Signup and view all the answers

<p>hunting by spreading humans, climate change, spreading disease, and an impact from an asteroid or comet</p> Signup and view all the answers

<p>mammals larger than approximately 44 kg (about 100 pounds)</p> Signup and view all the answers

<p>The uplift of the Appalachians and the sucking of CO2 out of the atmosphere by newly exposed silicate rock.</p> Signup and view all the answers

<p>Sea creatures such as trilobites, brachiopods, and graptolites.</p> Signup and view all the answers

<p>The emergence of newly evolved land plants that released nutrients into the ocean, triggering algal blooms and depleting oxygen.</p> Signup and view all the answers

<p>Reefs, which did not return to their former glory until new types of coral evolved over 100 million years later.</p> Signup and view all the answers

<p>96% of ALL species.</p> Signup and view all the answers

<p>Land animals, with 65% of them dying out.</p> Signup and view all the answers

<p>A very dry climate and prolonged periods of volcanic activity, known as the Siberian flood basalts.</p> Signup and view all the answers