What is a measurement of the earth's history divided into time periods a)fossil record b)sedimentary rocks c)geologic time scale d)radioactive elements

The correct answer is option C.

Explanation:

Geologists have divided the history of the earth into time intervals using significant events of the history based on the strata of the rocks. They called it a geological time scale.

These time intervals are not regular but irregular which varies in length from million to billion of years. This time scale begins around 4.0 billion to 2.5 billion years ago in Archean Eon which continues till today.

Thus, option C is the correct answer.

the offspring would all be white. if the parents are both white flowers then they have the genotype rr, which when crossed results in an all white punnet square.