Noun is the answer make sure to thank me :)
Answer:
I finished the assignment.
Explanation:
The "when" at the beginning of the sentence makes it a fragment. You could even make it a complete sentence by adding on to it. For example:
When I finished the assignment, I turned it in to my teacher.
~ology = the study of ~
example: biology is the study of life
c. a belief of branch of learning
