Geologists have divided earth's history into time units, which are largely based on
a. oral histories.
b. written correspondences.
c. fossils.
d. climates.

Geologists have divided Earth's history into time units, which are largely based on fossils. The correct option among all the options given in the question is option "c". A Geological Time Scale or GST has been effectively used by geologists, paleontologists and variety of other people related to earth science. It is been already determined that the Earth is approximately 4.54 billion years old.

Icant awnser the qustion bc u have the planets not listed

You need to attach a picture of said triangles for people to be able to you.