Question

question 25
which of the following represents the longest amount of geologic time?
phanerozoic eon
jurassic period
cenozoic era
precambrian eon

Explanation:

In the geologic time - scale, eons are the largest units of time. The Precambrian Eon encompasses about 88% of Earth's history, which is longer than the Phanerozoic Eon. Eras and periods are smaller units of geologic time. The Cenozoic Era is part of the Phanerozoic Eon, and the Jurassic Period is part of the Mesozoic Era.

Answer:

D. Precambrian Eon