Question

A ????????? fish controls the concentration of salt in its body by actively excreting salt across its gills, drinking, and producing very small amounts of concentrated urine.

Answer 1

@jbluver!!
@KeganMoore
@kyle7009

Answer 2

@shenandoah123

Answer 3

A freshwater fish, when in salt water they need to keep the bodily salt concentration on a level lower than the surroundings. Their gills must be able to diffuse dissolved gasses while keeping the salts in the body fluids inside.