Which period belongs to the Paleozoic era and not the Cenozoic era? Help please
15 points

In iceland, the mid atlantic ridge runs through the center of the contry. what can you conclude about the apperence of iceland many thousands of years from now?

What is the importantence of the carbon and nitretan cycles in the environment

Hurry which of these is true about index fossils? a) are very scarcely found b) used as guides in relative dating c) found in the youngest layer of the rock d) used as reference points in absolute dating