Biology help please? Only three questions?

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1. Which of the following organs is responsible for removing nitrogenous waste by producing urea?
a. small intestine
b. liver
c. kidney
d. urinary bladder


2. Which of the following describes how kidneys remove nitrogenous waste from the blood?
a. They remove protein remains and produce urea.
b. They filter the blood for urine and collect it.
c. They filter urea from blood and produce urine.
d. They produce urea and send it to the liver for urine production.


3. Which of the following parts of the kidney collects the urine after it is produced?
a. renal vein
b. renal medulla
c. renal cortex
d. renal pelvis



10 points goes to best answer. Thanks.
 
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