Which signal word indicates a substance is of limited danger but still requires caution?

The choice of "CAUTION!" as the signal word indicating a substance is of limited danger but still requires caution is correct because this term is specifically designed to convey a moderate level of risk. In pesticide labeling and safety communications, signal words are standardized to help users quickly assess the relative toxicity of the product.

"CAUTION!" suggests that while the substance is not highly toxic, there are still potential hazards that necessitate careful handling and usage. This designation often applies to products that may cause mild irritation or adverse effects if proper precautions are not taken.

In contrast, "DANGER!" signifies a high level of toxicity with immediate health threats, while "WARNING!" is used for moderate hazards that are more serious than those indicated by "CAUTION!" The term "SAFE!" is not a recognized signal word in pesticide labeling and does not correspond to any level of toxicity; it implies no hazards, which is not applicable to substances that require caution. Thus, understanding signal words is crucial for safeguarding health and ensuring responsible use of chemical substances.