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 rock. they then use index fossils to relate the layers to those in multiple, extended, short.

Explanation:

Index fossils are from organisms with short - lived existence, useful for dating rock layers and correlating them across different regions. Geologists first establish relative age of rocks and then use index fossils for further correlation.

Answer:

Index fossils are the remains of organisms that lived on Earth for short periods. First, geologists use relative age to determine the age of the rock. They then use index fossils to relate the layers to those in multiple areas.