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Answer:
They don't have the complex system of roots, specialized tissues and leaves that help plants move water and nutrients in their body. Seaweeds can do photosynthesis in all their tissues; most plants photosynthesize only in their leaves.
They are unicellular
Step-by-step explanation:
All plants beside seaweed (algae) are multicellular; they are made up of more than one cell.
Seaweeds are unicellular; they are made up of only one cell.