Answer:
The correct options are: stomach, mouth, eyes, skin
Step-by-step explanation:
Eyes: Our tears contain an enzyme which is beneficial in breaking down the cell wall of many bacteria's.The blinking of the eye also stops many bacteria's o enter into the eye.
Skin: The skin of a person acts as a barrier between any foreign pathogen and the body of a person. The hair present on the skin tend to trap many microorganisms and prevent them from entering into the body.
Mouth: Our mouth produces saliva which has many enzymes to kill pathogens in food.
Stomach: The stomach acids tend to kill any pathogens which enter through swallowing.