Abstract or Resume?

Should I submit a resume to further explain my leadership positions and extracurriculars for supplementals? Or would it be better for me to submit an abstract on lead poisoning that was accepted to a medical conference? I participated in writing the abstract during sophomore year, so it is a while back. I am applying for nursing and wish to participate in research opportunities at UPenn.
Thank you!

And it wasn’t just me who wrote the abstract, it was a group of 7. I was not the main author.

I think the resume would be better. You should put a little description (like 2-3 bullet points or sentences) next to this research thing though