The three eras that have taken place since the end of the ...

[humphriesbr@me.com]

The three eras that have taken place since the end of the Precambrian from oldest to youngest are the
  ___________________ _, ___________________ _, and ___________________ _. Fill in the blank(s) with the appropriate word(s).

Question 2

The two primary materials that geologists use as clues to understand Earth's past are
  ___________________ _ and ___________________ _. Fill in the blank(s) with the appropriate word(s).

[tjayeee]

Answer to Question 1

Paleozoic, Mesozoic, Cenozoic

Answer to Question 2

rocks, fossils
fossils, rocks

[humphriesbr@me.com]

Thanks for the timely response, appreciate it

[peter]

Excellent