Ocean Greens: Explore the World of Edible Seaweed and Sea Vegetables: A Way of Eating for Your Health and the Planet's | 
Some fun facts about seaweed:
"Seaweed is the umbrella term for the entire group of macroalgae that live in salt water, brackish water, or freshwater. Algae can be divided into two groups: microalgae (unicellular organisms, like chlorella) and macroalgae (multicellular organisms, like seaweed). ... It's estimated that multicellular seaweeds came into existence about 1.2 billion years ago."
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