It's not harmful at all.
they arn't
i dont kow
it is harmful...affects human health!
A material that can be harmful if not properly disposed of is hazardous.
Food is essential to human life and health. All humans should have access to a variety of foodstuffs that contain the vitamins and minerals essential for human health. But too much food is harmful to humans and every effort should be made to avoid the possibility of food impacting negatively on human health.
Extremophiles are a danger to human health. Extremophiles can be a danger to plants.
See "How does ozone affect human health?" in the "Related questions" section below.
Some bacteria are beneficial to humans, and some bacteria are harmful to humans.
hazardous wastes
hazardous wastes
Radon gas.
yes and that is kind of disgusting. Feces is human waste and filled with harmful bacteria. It is very bad for you health.