<u>The disappearance of organisms from the geologic record provides evidence for </u><u>periods of mass extinction</u> (number 4). When diverse organism assemblages disappear at, or near, a single geological horizon, we are able to postulate a catastrophic event. An indication of disappearance of organisms from the geologic record may be sufficient to establish an revolucionary change. This question is related to geologic history.
<em>Note: Clues of environmental perturbations can show us many biological revolutions on a world scale.</em>
he first 2 centuries of the Empire saw a amount of unexampled stability and prosperity called the Pax Romana ("Roman Peace"). Rome reached its greatest territorial expanse throughout the reign of Trajan
<span>This led to "<span>decolonization" The end of
World War II brought about a new economic dependency and interplay
between European countries that made much of colonization relatively
unprofitable. </span></span>