Definition: The word "archeozoic" describes a period spanning roughly 425 million years ago to about 398 million years ago during Earth's geological history. It refers to a time when the planet was more active than it is today, with its climate and ecosystems undergoing significant changes. The definition of "archaeozoic" includes: - The beginning: approximately 4.5 billion years ago - The end: roughly 398 million years ago (when Earth's surface temperature reached an all-time high) - The period when life on Earth evolved and formed complex forms - It is also the age of the dinosaurs, which was a time when their extinction event led to widespread mass extinctions. The term "archeozoic" has been used extensively in the scientific community for various geological and biological events.