The big similarity between the sandwich and a molecule is that the sandwich is made up of different ingredients, like the molecule is made up of different atoms.
This comparison highlights how both entities are composed of distinct components that come together to form a whole. In a sandwich, the ingredients (e.g., bread, lettuce, tomato, meat) combine to create a delicious food item, while in a molecule, different atoms bond together to form a chemical compound. This analogy emphasizes the structural similarity between the two, illustrating how complex systems can be formed from simpler parts.