The “Algae” lesson helps students understand what algae are, where they live, and how scientists recognize them. Through drag-and-drop challenges and visual clues based on real microscopic specimens, learners classify algae into major groups, connect them to diverse habitats, and practice identification using a simple teaching key. Students encounter freshwater and marine species, symbiotic algae, and even forms adapted to extreme environments such as snow or hot springs, building observation s