Answer:
The translation is "Sources of water supply: characteristics of each one of them and their implications in the extraction sites."\
Needs more clarification: Which time tense is it referring to?
What roles water...............................................
¿Cuál de las siguientes palabras es siempre masculina?
Answer: Pupitre.
Explanation: The other words can be masculine or feminine: Un dentista / una dentista , un estudiante/ una estudiante , un inteligente /una inteligente.
None of those makes sense but the closer one is a (soy)