What were the three major invasions of living creatures on land?

The three major invasions of living creatures onto land occurred during different geological periods. The first was the colonization by plants, beginning around 475 million years ago during the Ordovician period, which allowed for the development of terrestrial ecosystems. Next, arthropods, such as insects and arachnids, invaded land around 400 million years ago during the Devonian period. Finally, vertebrates, particularly amphibians, made their transition to land approximately 360 million years ago, marking a significant evolution in terrestrial life.