What defines delayed effects of pesticide exposure?

Delayed effects of pesticide exposure are characterized by symptoms or health issues that manifest not immediately, but rather long after the initial contact with the pesticide. This could potentially range from weeks to even years after the exposure, highlighting the long-term consequences that certain chemicals can have on health and the environment. Such delayed effects may include chronic health conditions or diseases that develop over time, emphasizing the importance of monitoring for symptoms even after the exposure has seemingly passed.

The other choices focus on immediate reactions or shorter time frames (such as days or long-term exposure), which do not accurately capture the essence of what defines delayed effects. Delayed effects specifically refer to the latency between exposure and the presenting symptoms, making them critical to understanding pesticide impact. Hence, option D is the correct choice as it conveys this crucial aspect of delayed pesticide exposure effects.