What method explains how pesticides can enter animals, including humans?

The correct choice reveals that pesticides can enter animals, including humans, primarily through three main pathways: ingestion, inhalation, and absorption.

Ingestion refers to the consumption of pesticide residues through contaminated food or water, which is a common method of pesticide entry into the body. Inhalation occurs when pesticide particles or vapors are breathed in, which is a significant concern during application or if pesticides are present in the air. Absorption is the process where pesticides enter the body through the skin or mucous membranes, which can happen during handling or application if proper protective measures are not taken.

These three methods are crucial for understanding how pesticides pose potential health risks or environmental impacts, making them important considerations for safe application practices and risk assessments. By focusing on these pathways, individuals working with pesticides can better implement safety protocols to minimize exposure risks.