How would our understanding of Earth's past change if a scientist discovered a mammal fossil from the Paleozoic Era

Aletsch glacier is the largest glacier in switzerland and the largest found in the alps, a mountain range which extends from monaco in the east to slovenia in the west. currently, the aletsch glacier is retreating. under what circumstances would this glacier see growth instead of retreat? a decline in plate tectonics across the mountain range annual snowfall that exceeds yearly losses an increase in ablation in the southern valleys a rise in temperatures to that of a mediterranean climate

Name one type of data that h-r diagrams do not show.

Can someone me? i need to have this done as soon as possible! i'm putting 20 points on this!