Ineed right !
how does the mass conservation apply on the water cycle?

Explanation:

In this case some water is converted into energy and energy and mass are intercovertible so conservation of mass is applying in this case

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.