Answer:
A) They are named for the places where geologists first described rocks or fossils from that time
Explanation:
The relationship between plant and animals, layers and types of rocks, fossils and radioactive dating are used for preparing Geologic Time Scale. Geologic time is comprise of four Eons namely Hadean (the initial stage) followed by Archean and Proterozoic and Phanerozoic in the recent . The Eons are classified into eras and theses eras reflect the changes in fossil record. Eras are further divided into periods and some periods into Epochs.
In periods a single rock system is found while the division in the era's reflect major changes in fossil record.
1. lose what they fought for
2. many soldiers die
3. country can go in det
A Civil War best serve as a turning point between two historical periods.
The answer is C plz make be the brainlist answer
