Which of the following is the best name for mgcl2

How do the kidneys affect homeostasis

How much energy is supplied to each coulomb of charge that flows through a 12-v battery?

According to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does maria's voyage take according to samir?