Question

use the drop - down menus and what you know about index fossils to choose the correct answers. index fossils are the remains of organisms that lived on earth for periods. first, geologists use relative age to determine the of the layers of rock. they then use index fossils to relate the layers to those in locations.

Explanation:

Index fossils are from organisms that lived for short time - spans. Geologists use relative age to order rock layers. Index fossils help relate layers in different locations for correlation.

Answer:

1. short
2. order
3. different