Solution:
Roaring is an integral component of African lion ecology as it facilitates social cohesion and territorial defense. In fact, as both a social and territorial species, communication is essential to lion ecology and roaring is perhaps the most important vocal cue.
An example of the importance of the roar would be that lions can discriminate between resident and non-resident lions, determine the relative risk of encountering unfamiliar lions, and detect the ratio of residents to intruders from roaring choruses.