True or false: The divisions among Eras reflect major changes in the fossil record, including the extinction and appearance of new life forms. *

In the water cycle , when does water undergo a chemical change

How much time has elapsed from the very beginning of "the memior of the conquistador bernal diaz del castillo" to the end? a. castillo's whole life b. a quarter of an hour c. a few weeks d. a decade

Wich is not standing in the way of astronomers getting a good view of different star