Which of the following are pathways for toxicants to enter into our body?

Toxicants mainly enter the body through inhalation and absorption, Statements 1 and 2.

Inhalation, Statement 1, draws airborne toxicants into the lungs.

Absorption, Statement 2, covers uptake through the skin and the gut lining.

Dermal contact and ingestion, Statements 3 and 4, are specific forms of that absorption rather than separate broad pathways.

Extraction, Statement 5, is a laboratory process, not a route of entry into the body.

The dose and duration of exposure determine how harmful an entering toxicant becomes.