Do you know more about the Paleozoic or the Mesozoic? [Moderator:
Do you know more about the Paleozoic or the Mesozoic? [Moderator: Await response and read the appropriate bonus]  I. F15PE, identify the following large-scale extinction events from the Paleozoic era.  A. Some scientists have claimed that it may have been started by a short gamma ray burst caused by an exploding star near earth. It resulted in the extinction of approximately 49% of marine genera and decimated trilobite, graptolite, and brachiopod populations. It coincides with what is believed to be the largest ice age of the Phanerozoic eon.
Do you know more about the Paleozoic or the Mesozoic? [Moderator:
Ordovician-Silurian Extinction Event