Q2: Hazardous materials is any material that can harm people, other living organisms, or the environment. Hazardous waste is waste that are dangerous or potentially harmful to human health or the environment.
Q4: Types of infections can be bacteria, viruses, fungi, protozoa, parasites, and prions.
Q5: Stress is your body's reaction to challenge or demand. Some effects of stress can either be emotional exhaustion and even physical exhaustion, damage, and illness.
Those are the only questions i know,, hopefully this helps a little bit!