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Which three groups contain large algae known as seaweeds? which three groups contain large algae known as seaweeds?

User KidTempo
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The three groups are green algae, red algae and brown algae.Seaweeds are a group of photoautotrophic, multicellular algae occurring  in marine environments. They are simple organisms that can perform photosynthesis. They have characteristics such as they are non-vascular plants, flowerless, seedless, lack embryos and cells contain chlorophyll among other characteristics. 
User Ajinzrathod
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