Answer:
The Geologic Time Scale is a system of chronological measurements that relates to the study of rock and layers.
While the human time scale is the portion of the pedogenic time scale that covers periods of centuries, decades, or less.
Explanation:
Wouldn't this be a math question? But anyway, the answer is 3(x-2)(x+1).
C . Telegraph ..............
A thermometer, a barometer, a sling psychrometer, and a rain guage