Which division of the geologic time scale includes most of Earth's history?

Answer: Four geological ages.

Explanation:

he development of the country is divided into four geological ages, prehistoric or Precambrian, ancient or Palaeozoic, Middle Ages Mesozoic, and New Age Cenozoic.

The Precambrian period begins after the formation of the Earth's crust and lasts about 4 billion years, and it is the oldest and most extended period of Earth's history. The beginning of the old age was marked by intense volcanic activity and the Ice Age. The Middle Ages were the period of the dinosaurs who were the dominant beings of that period. The new age, or the age of mammals, begins with the change of the warm and cold periods and continues to this day.