The advantage of excreting nitrogenous wastes as urea rather than ...

[j_sun]

The advantage of excreting nitrogenous wastes as urea rather than as ammonia is that
A) urea can be exchanged for Na+.
B) urea is less toxic than ammonia.
C) urea requires more water for excretion than ammonia.
D) urea does not affect the osmolar gradient.
E) less nitrogen is removed from the body.

[sammy]

I remember it was B

[j_sun]

Thanks dude! Marking this solved.