Certain fossils, such as Trilobites found after the Cambrian explosion, are found in the same geologic time period all over the world. What is the importance of fossils that are consistently found in the same geologic time period?

Fossils consistently found in the same geologic time period allow us to infer that the organisms whose fossils are found were prevalent/widespread to a certain extent during that time period.

name and explain one of the event that occurs during meiosis that increases the variation in offspring even more than simple reproduction?