My fellow Buddhists, were the first living beings on earth animals? Where do their souls come from? For example, 600 million years ago there were only trilobites on the earth.

Human society on the earth rises and falls like waves. The maximum 80,000 years refers to the average life span of human beings during the longest period of alternating tribulations of increasing and decreasing kalpas. There must have been humans before the age of dinosaurs, but humans at that time may not have lived on the ground, or they may have transformed their bodies into the beast bodies of the dinosaur era due to industrial factors.