Final answer:
Pieces of glass and strands of hair are considered physical hazards that can cause injury or harm through cuts, choking, or contamination. They differ from chemical hazards that include pollutants affecting wildlife.
Step-by-step explanation:
Pieces of glass and strands of hair are typically classified as physical hazards when considering safety and health contexts. These objects can potentially cause injury or harm if they are mishandled or encountered unexpectedly. Glass can break and cause cuts, while loose strands of hair can create a choking hazard or contaminate food in a kitchen setting. In the environment, particularly in aquatic systems, substances like glass do not pose the same kind of chemical hazard that pollutants or small plastic particles might, which can act as hormone disrupters affecting wildlife. Instead, larger pieces of debris, including glass or plastic waste, present a physical hazard to animals that might ingest them or become entangled.