Question

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

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

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

Ammonites existed for a relatively limited period of time.
Ammonites existed for a relatively limited period of time.

Ammonites existed in a small geographic area.

Answer 1

Ammonites existed for a relatively limited period of time.

(That short, distinctive time range makes them useful for correlating and dating rock layers.)