Final answer:
Most foodborne illnesses happen due to contamination of food by microorganisms, toxins, or foreign bodies. Bacteria, viruses, and parasites are the main culprits behind foodborne diseases.
Step-by-step explanation:
Most foodborne illnesses happen due to contamination of food by microorganisms, toxins, or foreign bodies. Bacteria, viruses, and parasites are the main culprits behind foodborne diseases, but toxins and chemicals can also contaminate foods. Contamination can occur through improper handling, preparation, or storage of food, poor hygiene, cross-contamination, and failure of temperature control. Food safety practices, such as regular handwashing and maintaining the correct refrigerator temperature, are essential in preventing foodborne illnesses.