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Algae
Algae are a very large and diverse group of simple, typically autotrophic organisms, ranging from unicellular to multicellular forms, such as the giant kelp, that may grow up to 50 meters in length. Most are photosynthetic and "simple" because they lack many of the distinct cell organelles[which?] and cell types found in land plants. The largest and most complex marine forms are called seaweeds.
source:wikipedia\Image by: jurvetson
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