The Phanerozoic eon is the most recent and current geologic eon on Earth, spanning from 541 million years ago to the present day. Synonyms for this eon include the "Visible Life Eon" or the "Age of Abundant Life". During this time period, there have been several major evolutionary events, including the emergence of complex organisms such as animals, as well as the diversification of life into various forms. The Phanerozoic eon is divided into three eras: the Paleozoic, Mesozoic, and Cenozoic. Each era is characterized by unique geological events and significant changes in the environment and climate.