How can pesticides enter the body according to the route of entry?

Pesticides can enter the body primarily through ingestion and inhalation, which are two significant routes of exposure. Ingestion occurs when a person accidentally consumes pesticide residues, often through contaminated food or water. Inhalation occurs when airborne particles or vapors of pesticides are breathed in, which is particularly relevant when applying pesticides in enclosed or poorly ventilated spaces. Understanding these routes helps individuals take proper precautions to minimize exposure and protect their health, making it essential information for anyone working with or around pesticides.

Other options, while they may involve some aspect of exposure or health, do not accurately represent the primary routes through which pesticides typically enter the human body. Vaccination is unrelated to pesticide exposure, skin contact is just one of several possible routes, and environmental exposure alone does not encompass the full range of entry methods for pesticides, as it could refer to broader ecological impacts rather than specific physiological pathways.