In English syntax, coordinated clauses are structures connected by coordinating conjunctions. Read the statements below carefully:
I.The lecturer presented the new methodology, and the students took notes during the discussion.
II.The engineers completed the project, but the final inspection revealed additional concerns.
III.The company expanded its operations because the international market showed significant growth.
IV.The researcher reviewed the data and published the article in a scientific journal.
V.The assistant organized the documents while the supervisor attended the administrative meeting.

Identify in which statements there is the employment exclusively of coordinated clauses, without the presence of subordinate structures.