Final answer:
Animals do not produce starch; instead, they store glycogen and fats for energy. Therefore, if an animal product tests positive for starch, it is likely contaminated or mixed with a plant product.
Step-by-step explanation:
Starch is a mixture of two polymers: amylose and amylopectin. Animals do not produce starch; instead, they store glycogen and fats for energy. Therefore, if an animal product tests positive for starch, it is likely contaminated or mixed with a plant product. This could occur due to cross-contamination during processing or additives containing plant-based ingredients in the animal product.