Plastic particles exist in large quantities in the oceans. Chemical contaminants can adsorb, or 'stick' onto these particles. In this way, harmful chemicals can enter the food chain because plastic particles can be mistaken for food by aquatic life. Bisphenol-A (BPA) is one such chemical contaminant and has been recognized as an endocrine system disruptor. Endocrine system diruptors are any chemicals that interfeir with the bodies hormone producing organs. BPA is used in certain plastics and resins in a high variety of products and is therefore a widespread contaminant.