They're a species of brine shrimp, called Artemia salina. They enter a state of hibernation in tiny cysts which are mostly dry, and thus can be packaged and sold. When introduced to water again, they break out of their cysts and live again, producing the "Sea monkey" aquarium. I figured they were some form of tiny aquatic animal, an arthropod, or not real at all, but I'm glad I looked it up.
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