Describe the two most important events in the history of animal life that occurred at the beginning and at the end of the paleozoic era. list and briefly outline the six different periods into which the palezoic era is divided.

What were some reasons the russian people grew to oppose world war i? check all that apply. millions had been killed. food and supplies were running out. the tsar had been overthrown. soldiers were forced to fight. industrialization was happening too quickly.