Question

red blood cells are the most common type of blood cell. they are responsible for carrying oxygen from the lungs to all the various body tissues. these cells are shaped like concave discs, and they do not have mitochondria or nuclei.
how does this structure help the cell carry out its function? (1 point)
the smooth edges of the cells allow them to flow easily through blood vessels without becoming lodged, even in the small capillaries
the shape provides a larger surface area with which the cells can bind and transport oxygen
the lack of organelles such as nuclei and mitochondria, creates more space for hemoglobin—the molecule that binds and holds oxygen molecules
all of these

Explanation:

The smooth edges of red - blood cells facilitate easy flow through blood vessels. Their biconcave shape increases surface area for oxygen binding. The lack of organelles creates more space for hemoglobin which binds oxygen. So all the given factors contribute to their function.

Answer:

D. all of these