Respuesta :
Answer:
They are unicellular
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.
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.