Final answer:
Firearm-related deaths are a significant portion of homicides among 15-19 year olds, although the exact percentage requires specific data.
Step-by-step explanation:
Firearm-related deaths make up a significant portion of all homicides within the 15-19 age group, an issue that has been highlighted by ongoing debates about the accessibility of firearms and their role in mass shootings. Given the contribution of these deaths to overall homicide rates involving youths, the data indicate that they constitute a sizable percentage, although specific numbers vary by location and over time. In addressing the question posed, without recent and specific data, we can provide an educated guess based on historical trends and the context provided.