The functional structure in the kidney is

nephron

nephron, functional unit of the kidney, the structure that actually produces urine in the process of removing waste and excess substances from the blood.

the answer is: apostrophe and allusion.

apostrophe refers to a poetic technique that is used to address an absent individual or an abstract idea/being. allusion on the other hand is a poetic technique that being done by making an indirect reference to other person with a high level of significance (could be historically or culturally significant)

a ^^ hope this