No.
you use the subjunctive the talking about things that aren't facts or certain, like emotions, suggestions, doubt, etc.
for example, if i were to say "yo pienso que tu debas estudiar" (i think that you should study), just because i think you SHOULD study doesn't mean that you actually will, thus making it subjunctive
Hope this helps :)
París es una ciudad. Francia es un país.
Respuesta:º A. País
Ferns are not of major economic importance, but some are used for food, medicine, as biofertilizer, as ornamental plants and for remediating contaminated soil. They have been the subject of research for their ability to remove some chemical pollutants from the atmosphere.