Fill in the Blanks biological contaminants Online version biological contaminants game by Janell Cossai 1 old cross preparation yeasts Mould Salmonella digestive food viruses Waste preparation air parasite pollution contaminated contamination process Examples of bacteria : E . coli , Listeria , and Examples of : Norovirus and astrovirus A is a plant or an animal organism that , if consumed , lives in your system . Moulds and grow on old foods where there is moisture present . could also produce toxins which make foods which are moulding not safe to consume . When crops are growing in areas of higher , contaminants in the air can also contaminate the foods . During , one must make sure to work in clean air environment . Raw foods ad cooked foods / read to eat foods should never touch each other to avoid . Effort should be made throughout the . contains a lot of bacteria , especially if it is waste . If waste comes into contact with food during preparation , or cross contamination with the waste occurs , the food could be .