Know anything about biology?

[schoolsux!]

Which of the following statements about freshwater fish is false?
A) They do not drink.
B) They use their gills to actively take up salt ions.
C) They lose water through their gills by osmosis.
D) They produce large volumes of dilute urine.
E) Their food supplies some ions.

The transfer of heat from arteries carrying warm blood past veins returning cooler blood is an example of
A) insulation.
B) a countercurrent heat exchanger.
C) evaporative cooling.
D) behavioral thermoregulation.
E) metabolic heat production.

[? Amy Z ?]

C is false. That only applies to SALTwater fish, not freshwater. The rest are true for freshwater fish.

B. The veins and arterial blood run in opposite directions. Away from and to the heart...so the exchange of heat is by a counter current.