Should water (H20) be included in the model as a reactant or product? If so, how should it be included? A. Yes, as reactant A.
B. Yes, as product B.
C Yes, as reactant C
D No, it should not be included.

How can a geological time scale best be reconstructed? a) comparing vestigial structures in living species b) comparing homologous structures in living species c) examining homologous structures in fossil remains d) examining the written records of scientists from past cultures