Leo the Leaf learns about photosynthesis from Lily, Wally the Earthworm, and Dot the Ladybug. He discovers how plants use sunlight, water, and carbon dioxide to make food (sugar) and release oxygen via chloroplasts. This story covers the interconnectedness of living things within a STEAM framework by integrating science (photosynthesis, plant biology), technology (describing chloroplasts as mini-kitchens), engineering (how roots deliver water), art (colors of leaves and sun), and math (counting ingredients).