The question is incomplete as it does not have the options which are-
Answer:
The correct answer will be- cytoskeleton
Explanation:
The shape of the red blood cell is "biconcave" which could be due to the elasticity or bending property of the cell membrane.
Also, the shape of the red blood cells is maintained by the "cytoskeletal structures" like microtubules, intermediate filaments and the actin filaments. These structures help determine and maintain the shape of the cell.
Thus, the cytoskeleton is the correct answer.
