Among the options provided, starch is the largest molecule.
- Starch is a polysaccharide made up of many glucose units linked together, making it a large macromolecule.
- Salt (sodium chloride) is composed of individual sodium and chloride ions, which are much smaller than starch molecules.
- Glucose is a simple sugar (monosaccharide) and is smaller than starch.
- Water (H₂O) is a small molecule and is significantly smaller than starch.
So, the correct answer is starch.
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