Sentence:  Surprisingly, this analysis revealed that acute exposure to solvent vapors at concentrations below those associated with long-term effects <WSD>appears</WSD> to increase the risk of a fatal automobile accident. Furthermore, this increase in risk is comparable to the risk of death from leukemia after long-term exposure to benzene,.... 
Meaning of the word marked with <WSD> tags:  To become visible to the apprehension of the mind; to be known as a subject of observation or comprehension, or as a thing proved; to be obvious or manifest.