Explain the meaning of harmful substance in food production

Harmful biological substance” means a bacteria, virus or other microorganism or a toxic substance derived from or produced by an organism that can be used to cause death, injury or disease in humans, animals or plants.

Harmful substance are elements that are dangerous to human health. They are water, fruits, food and drugs that are unfit for human consumption.

You should check out the situation and then ask questions like “are you choking”? and if they are able to respond they should nod and if they are not making sound do the heimlich maneuver. i hope this .