FRAGMENT FROM NATURE continues from last weekend and concludes this weekend on the return of seagrasses to the water after their epic conquest of terrestrial habitats on leaving the sea. This is the plant equivalent of the whale journey, and no less difficult genetically, biochemically, metabolically, and anatomically. On leaving the sea for the land they became different organisms, and so with their return to the sea. It is an epic story in the true sense of the word, impressive in scope and achievement, the Iliad of the plant world.