The kidneys are paired structures that
a. transport urine to the bladder
b. in digestion of carbohydrates
c. regulate salts, waters, and other minerals
d. absorb nutrients into the bloodstream

The correct answer is C.

The kidneys are paired structures that regulate salts, waters and other minerals.

The kidneys remove waste from the blood and regulate the amount of salts, water, and other minerals in the body. The ureter carries urine from the kidneys to the bladder.

a transport urine to the bladder and c. regulate salts, waters, and other minerals They are responsible for taking out extra fluids when we urinate.  It also controls the salt, potassium and acid content of the body. It also contributes to the production of red blood cells.

b is the correct answer

this is true my friend.