Passage Summary: Ants put tree sap in their nests. This sap kills germs that make ants sick, so the author thinks the ants use it specifically to stay healthy.

Conclusion: The use of conifer resin by European wood ants likely developed as a way to protect the colony from disease.

Reasoning: The resin contains natural disinfectants that are known to kill bacteria that are harmful to these specific ants.

Analysis: To evaluate this argument, we need to determine if the antibacterial benefit is the primary reason for the behavior or just a side effect. If the ants use the resin for something else entirely, like structural integrity or waterproofing, the 'disease-protection' theory loses its punch. Look for an answer choice that asks about alternative uses for the resin or whether the ants' behavior changes based on disease presence. This will help determine if the correlation between resin and health is actually a causal relationship.