Answer:
Kidneys couldn't work without the urinary tract because waste couldn't leave the body.
Step-by-step explanation:
Kidneys have an important function: to filter out waste or toxins. Each kidney is attached to a ureter, which is tube that propel urine from the kidney to the urinary bladder. That's why the statement should be this way: ''Kidneys couldn't work without the urinary tract because waste couldn't leave the body''.