Final answer:
Large ice crystals in a case of frozen food indicate that the product may have been thawed and refrozen.
Step-by-step explanation:
Large ice crystals in a case of frozen food indicate that the product may have been thawed and refrozen. When frozen food is thawed and then refrozen, water molecules in the food can form large ice crystals. These ice crystals can alter the texture and quality of the food.