Based on interpretations of rock units and changes in fossil life forms, geologists have divided earth’s history into manageable units that are represented by the
a. geologic time scale
b. geographical time scale
c. precambrian time scale
d. fossil time scale

The answer is A. The division in geologic time is not equal, some are longer than others (time is in millions of years). Example of geologic scales is Permian, Triassic, Precambrian and the Paleozoic. The geologic time scale is also sub-divided into era, periods and epochs based on principles of fossil evidence, relative dating, and radiometric dating.

answer: i'm not sure which is which for i get confused on it all the time but i can tell you that the answer lies with the convex and concave devices. i hope this you. have a good day and best of luck to you!

explanation:

a 2,000 calorie based diet.