Final answer:
Iodine, glucose, starch, and membrane pores should be ranked by size as follows: Iodine, Glucose, Starch, Membrane pores.
Step-by-step explanation:
The correct ranking of the given substances by size is:
- Iodine
- Glucose
- Starch
- Membrane pores
Iodine is the smallest substance on the list, followed by glucose, starch, and membrane pores. This ranking is based on the relative molecular sizes of the substances, with iodine being the smallest and membrane pores being the largest.