This is the 1673rd most frequent Spanish word.
presentaron
"Presentaron" means "they presented" or "you (plural) presented" in English.
Here 'presentaron' is used in the past tense to indicate the action of presenting ideas.
Ellos presentaron sus ideas al comité.
They presented their ideas to the committee.
In this sentence, 'presentaron' is used reflexively to mean 'showed up' in the past tense.
Mis amigos se presentaron tarde a la reunión.
My friends showed up late to the meeting.
'Presentaron' here indicates that the students exhibited or displayed their projects in a formal setting in the past tense.