Help plsss Use your periodic table to complete missing information

Fluorine

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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

What noticeable trend from this graph might be used to make a conclusion?

In general, are there any major differences that you can see? explain