Ecologists know that all living things need energy. Ecologists know that most of our world’s energy comes from the sun. They study how plants take the sun’s energy and turn it into the food they need to grow. Ecologists want to learn how animals use that energy, too. This edition focuses on the energy cycle. As students learn about the energy cycle and related geography, they’ll move through the scientific method and will read, question, experiment, and record their findings.