Which statement explains why ammonites are a good example of an index fossil.

Question

Ammonites existed in a small geographic area
Ammonites existed for a relatively limited period of time
Ammonites existed only in the oceans
Ammonites existed long before the dinosaurs

Answer 1

The statement "Ammonites existed for a relatively limited period of time" explains why ammonites are a good example of an index fossil.