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Major groups of algae

Green Algae (Chlorophytes): many live in fresh water - rivers, ponds and soil - ranging from Chlamydomonas and dancing Volvox to the sea lettuce Ulva.

Red Algae (Rhodophytes): good to eat: Porphyra yezoensis or "nori" is used to wrap sushi, whilst dulse and laverbread are traditionally eaten in the UK.

Brown Algae: many seaweeds like common bladderwrack and giant kelp. Their tiny relatives include diatoms and dinoflagellates, and even the terrible malarial parasite Plasmodium.

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