What organic structure could be an example of an enzyme

Explain how ancient whale fossils found in eqypt are believed to support the theory of evolution.

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

Which of the following is a period in the paleozoic era? devonian cambrian permian all of the above