What does a skull and crossbones symbol indicate regarding a pesticide?

The skull and crossbones symbol specifically indicates that a pesticide is highly toxic and poses significant risks to human health and potentially other living organisms. This symbol is universally recognized as a warning sign for substances that can be hazardous, suggesting that they can enter the body through various routes such as ingestion, inhalation, or skin absorption.

This labeling is critically important for safety, as it informs users that extreme caution must be exercised when handling such products. Proper personal protective equipment (PPE) should always be used, and caution is advised to prevent any exposure. The symbol serves to alert users to the serious nature of the chemical's toxicity, ensuring that they are aware of the potential dangers associated with its use.

In contrast, the other options imply a level of safety, mildness, or effectiveness that does not align with the serious nature of a product marked with the skull and crossbones, emphasizing the need for careful handling and awareness of the potential health impacts associated with highly toxic pesticides.