Which of the Following Mechanisms Contributes to Osmoregulation in Both

Multiple Choice

Which of the following mechanisms contributes to osmoregulation in both marine and freshwater bony fish?

A) gain of water through food
B) gain of salt through the gills via active transport
C) excretion of hyperosmotic urine
D) gain of water through the gills via osmosis
E) loss of salt through the gills via diffusion