Which statement explains why ammonites are a good example of an index fossil?(1 point)

Question

Responses

Ammonites existed only in the oceans.
Ammonites existed only in the oceans.

Ammonites existed in a small geographic area.
Ammonites existed in a small geographic area.

Ammonites existed long before the dinosaurs.
Ammonites existed long before the dinosaurs.

Ammonites existed for a relatively limited period of time.

Answer 1

The correct statement that explains why ammonites are a good example of an index fossil is:

Ammonites existed for a relatively limited period of time.

Index fossils are useful for dating and correlating the age of rock layers because they are widespread, easily identifiable, and existed for a short duration of geological time. Ammonites meet these criteria well.