A search at www.google.com on "sea monkey life cycle" found lots of pages about the life cycle. One of the best is at the Laboratory of Aquaculture and Artemia Reference Centre at the University of Ghent, in Belgium. Sea monkeys are artemia. They start as a cyst like egg, then become an embryo, then a nauplius, then a larva that goes through 15 stages called instars till it becomes an adult. Get the details at the Ghent university site above.