Nancy Larson® Science 4 focuses on organisms and their interactions as well as forms of energy. The emphasis is life science and physical science as lessons review and build upon topics taught in Science K–3. Life science lessons include introduction to cells and cell structures, botany (plants are examined and classified), characteristics of vertebrate and invertebrate animals, and ecosystems, including adaptations and behaviors of plants and animals. Physical science lessons explore energy, including kinetic and potential energy, sound, radiant energy, visible light, heat, and renewable and non-renewable energy resources. Introduction of electricity finishes the program with lessons on types of electricity and building series circuits, parallel circuits, and electromagnets.