Respuesta :
●The geologic time scale is a record of the GEOLOGIC EVENTS AND THE EVOLUTION OF LIFE FORMS as shown in the fossil record
●The first step in developing THE GEOLOGIC TIME SCALE was studying rock layers and index fossils worldwide.
●The first step in developing THE GEOLOGIC TIME SCALE was studying rock layers and index fossils worldwide.
Answer:
the awnser is
Scientists developed the geologic time scale as they studied rock layers and index fossils.
Explanation:
Precambrian time makes up 88 percent of Earth’s history.
The first birds appeared during the Jurassic period.
Humans appeared during the Cenozoic era.
