phanerozoic eon वाक्य

उदाहरण वाक्य

1. The Phanerozoic eon, encompassing the last 542 million years and almost the entire time since the origination of complex multi-cellular life, has more generally been a period of fluctuating temperature between ice ages, such as the current age, and " climate optima ", similar to what occurred in the Cretaceous.