Final answer:
Gayralia oxysperma is characterized by its unicellular structure, which is different from other green blades that may have complex multicellular forms with differentiated tissues and larger macrostructure.
Step-by-step explanation:
Gayralia oxysperma distinguishes itself from other green blades by its unicellular structure. Unlike macroalgae such as brown or red algae which often manifest in larger, multicellular forms with complex structures including stems, leaves, and holdfasts, Gayralia oxysperma is primarily a unicellular organism. The closest option that describes how Gayralia oxysperma looks different from other green blades is thus its unicellular structure.
For example, filamentous green algae like Ulothrix exist as strings of cells, which are essentially a series of connected unicellular organisms. On the other hand, many macroalgae have a more complex morphology, with differentiated tissues and multicellularity as seen in plants. Some green algae, however, such as Caulerpa, can be large and complex but are still considered unicellular because they consist of large, multinucleate cells.