Study the diagram of the geologic time scale. Which method is most likely used to identify what happened before the start of the Paleozoic era?

Hello. This question is incomplete. The full question is:

Study the diagram of the geologic time scale. Which method is most likely used to identify what happened before the start of the Paleozoic era?

a. Scientists study fossils from the Jurassic period.

b. Scientists observe index fossil records of the Mesozoic era.

c. Scientists examine fossil evidence during the Precambrian time.

d. Scientists explore the emergence of mammals and humans in the Cenozoic era.

c. Scientists examine fossil evidence during the Precambrian time.

Explanation:

As you may already know, to facilitate the study of the geological periods of the earth, scientists, especially geologists, decided that the history of the earth should be buried in eras, periods and geological periods, so that the studies could be done in more specific and organized way.

The geological era before the Paleozoic era is the Precambrian period. During this period, there were forms of life on earth that generated fossils that allow scientists to record, date and understand this period, in addition to being able to relate it to others. Thus, the method most likely used to identify what happened before the beginning of the Paleozoic era would be to examine fossil evidence during the Precambrian period.

the answer would be d : p