<h2>Based on the geological timescale, following would be the correct order of the prehistoric eras given:</h2>
<u>Precambrian Era: </u>This was the longest era of the four which lasted for about 2960 million years. The evolution of simple multicellular organisms happened in this era.
<u>Paleozoic Era: </u>The time span of this era was 295 million years. During this era, the first reptiles appeared on Earth.
<u>Mesozoic Era:</u>This era lasted for about 179 million years. The beginning of this era was marked by a mass extinction. The emergence of dinosaurs is believed to have taken place in this era.
<u>Cenozoic Era:</u>This era lasted for about 66 million years and was characterised by the emergence of humans in their modern form.
A correlation is some sort of connection between two or more ideas. The correlation between attendance and grades is that if a student has low attendance they would have lower grades than that of a student who had high attendance.