A major change that occurred in the evolution of eukaryotic cells from prokaryotic cells was the development of?

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

To be or not to be that is da question

What is the most common structure of volcanoes?