.help me please !!

The variability in marine salinity between habitats does not impact the fish living there. select the best answer from the choices provided t f

Ineed ! i have no clue how to do this problem.

How many liters of ethylene glycol antifreeze (c2h6o2), with a density of 1.100 g/l, would you add to your car radiator containing 15.0 kg of water if you needed to protect your engine to - 21.5°c? for water, kf = 1.86°c m -1.