How do the kidneys and the bladder work together? The kidneys absorb nutrients from the digested food, while the bladder releases the wastes.
The kidneys filter the nutrients out of the urine and the bladder absorbs the nutrients.
The kidneys produce urine and the bladder releases it out of the body.
The kidneys release urine out of the body, while the bladder releases solid wastes.

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Explanation:

From the kidneys, urine travels down two thin tubes called ureters to the bladder. The ureters are about 8 to 10 inches long. Muscles in the ureter walls constantly tighten and relax to force urine downward away from the kidneys. If urine is allowed to stand still, or back up, a kidney infection can develop

answer; i believe that the correct answer is (a); a large rock being weathered by wind and rain;

the product of the pressure and volume is also constant