What principle do scientists follow in studying ancient climates?
If plants or animals today need certain conditions to live, then similar plants and animals in the past also required those conditions
What are three pieces of evidence scientists look at to study ancient climates?
Pollen, tree rings, ice cores, fossils
How do scientists use pollen to study ancient climates?
They look at pollen that has accumulated at the bottom of lakes to find out what kinds of plants lived in an area