"It’s remarkable how much we can learn about life by studying nature. For example, scientists can look at the rings of trees and make educated guesses about climate and growing conditions hundreds and even thousands of years ago. One of the things we learn from studying the growth of trees is that during seasons when conditions are ideal, trees grow at a normal rate. However, during seasons when growing conditions are not ideal, trees slow down their growth and devote their energy to the basic elements necessary for survival."