Is the most specific part of the scientific name of an organism?
The 2nd part. The 1st part is the genus The 2nd part is the species (or specific part. "The first part of the name – the generic name – identifies the genus to which the species belongs, while the second part – the specific name or specific epithet – identifies the species within the genus. For example, humans belong to the genus Homo and within this genus to the species Homo sapiens. " Which is a quote fro here https://en.wikipedia.org/wiki/Binomial_nomenclature
the Species name, written out as a binomial with the genus and species,
If it's homework, then read the info in the link. You're after the epithet. http://www.anbg.gov.au/chah/avh/help/names/index.html