What correctly identifies the four routes of entry for toxic substances to the body?

The four primary routes of entry for toxic substances into the body are inhalation, ingestion, dermal absorption, and injection. Inhalation occurs when toxins are breathed in, while ingestion involves swallowing harmful substances. Dermal absorption refers to toxins entering through the skin, and injection involves substances being introduced directly into the bloodstream via needles or bites. Each route can lead to varying degrees of toxicity and health effects depending on the substance and exposure level.