Multiple choice

A fossil that existed briefly and is used in determining the relative ages of rock layers.

  1. index fossil

  2. hominid

  3. homologous structure

  4. arthropod

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Index fossils are fossils of organisms that lived for a short, well-defined period and were geographically widespread, making them useful for dating rock layers.