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

Question

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

Answer 1

The 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 characterized by their short time span and wide geographic distribution, which allows them to serve as guides to the relative ages of the rocks in which they are found. Ammonites fit this criterion well.