Final answer:
Flammable and combustible materials are substances that can catch fire easily and burn rapidly. Biohazardous materials contain biological agents or toxins that can be harmful. Both types of materials require careful handling.
Step-by-step explanation:
Flammable and combustible materials are substances that can catch fire easily and burn rapidly. They are identified by a symbol which is a black circle with a flat surface and a flame on it, as seen in the NFPA 704 Hazard Identification System. These materials pose a fire hazard and should be handled cautiously to prevent accidents.
For example, gasoline, alcohol, and wood are common flammable materials. They can ignite easily when exposed to a spark, flame, or heat source, and they burn rapidly, releasing energy in the form of heat and light.
In contrast, biohazardous materials refer to substances that contain biological agents or toxins that can be harmful to living organisms. These materials may pose a health hazard rather than a fire hazard.