Final answer:
The Paleozoic era saw the colonization by plants, the origin of multicellularity, and the development of eukaryotes.
Explanation:
The Paleozoic era, a significant period in Earth's history, witnessed crucial events including the colonization of land by plants, origin of multicellularity, and the development of eukaryotes. These milestones transformed life on Earth and laid the groundwork for future diversification and evolution.
Learn more about Paleozoic era biology here:
https://brainly.com/question/11936655
