Answer:
kidney
Explanation:
Urea is carried in the bloodstream to the kidneys. The kidneys are bean-shaped organs about the size of your fists. They are near the middle of the back, just below the rib cage. The kidneys remove urea from the blood through tiny filtering units called nephrons.
umm one would be to chew gum two would be hide the cigarettes on said person or to put them in a spot where they can not reach and three is to get rid of then entirely
They go on the first level of the pyramid!! Hope that this helped