Final answer:
In binomial nomenclature, the first word of an organism's scientific name represents the genus, which is capitalized, and the second word specifies the species within that genus.
Step-by-step explanation:
In binomial nomenclature, the scientific name of an organism includes two words. The first word represents the genus of the organism, which is a group that includes multiple species. The genus name is always capitalized. The second word is the species name, which identifies the specific species within that genus. For example, the scientific name for humans is Homo sapiens, where Homo is the genus and sapiens is the species.