Ninety percent of life's history in the geological time scale is occupied by the

a. Hadean Eon.

b. Archean Eon.

c. Proterozoic Eon.

d. Precambrian Supereon.

The correct answer for the question that is being presented above is this one: "b. Archean Eon." Ninety percent of life's history in the geological time scale is occupied by the Archean Eon. Archean Eon is a geologic eon, 4,000 to 2,500 million years ago following the Hadean Eon and preceding the Proterozoic